01678nas a2200193   4500008004100000022001400041245009400055210006900149260000800218300001600226490000700242520098400249100001801233700002801251700003001279700002301309700003001332856012201362       2015                        eng d  a1359-734500aSeeded on-surface supramolecular growth for large area conductive donor-acceptor assembly0 aSeeded onsurface supramolecular growth for large area conductive  cMAY  a10439-104420 v513 a<p>Charge transport features of organic semiconductor assemblies are of paramount importance. However, large-area extended supramolecular structures of donor-acceptor combinations with controlled self-assembly pathways are hardly accessible. In this context, as a representative example, seeded on-surface supramolecular growth of tetrathiafulvalene and tetracyano-p-quinodimethane (TTF-TCNQ) using active termini of solution-formed sheaves has been introduced to form an extended assembly. We demonstrate for the first time, the creation of a large-area donor-acceptor assembly on the surface, which is practically very tedious, using a seeded, evaporation-assisted growth process. The excellent molecular ordering in this assembly is substantiated by its good electrical conductivity (similar to 10(-2) S cm(-1)). The on-surface assembly via both internally formed and externally added sheaf-like seeds open new pathways in supramolecular chemistry and device applications.</p>1 aGoudappagouda1 aChithiravel, Sundaresan1 aKrishnamoorthy, Kothandam1 aGosavi, Suresh, W.1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/seeded-surface-supramolecular-growth-large-area-conductive-donor-acceptor-assembly01787nas a2200205   4500008004100000022001400041245012000055210006900175260000900244300001600253490000800269520105100277100001901328700002701347700001701374700001601391700003001407700001701437856012701454       2016                        eng d  a0002-786300aCounteranion driven homochiral assembly of a cationic C-3-symmetric gelator through ion-pair assisted hydrogen bond0 aCounteranion driven homochiral assembly of a cationic C3symmetri  cSEP   a11113-111160 v1383 a<p>The helical handedness in achiral self-assemblies is mostly complex due to spontaneous symmetry breaking or kinetically controlled random assembly formation. Here an attempt has been made to address this issue through chiral anion exchange. A new class of cationic achiral C-3-symmetric gelator devoid of any conventional gelation assisting functional units is found to form both right-and left-handed helical structures. A chiral counteranion exchange-assisted approach is successfully introduced to control the chirality sign and thereby to obtain preferred homochiral assemblies. Formation of anion-assisted chiral assembly was confirmed by circular dichroism (CD) spectroscopy, microscopic images, and crystal structure. The X-ray crystal structure reveals the construction of helical assemblies with opposite handedness for (+)- and (-)-chiral anion reformed gelators. The appropriate counteranion driven ion-pair-assisted hydrogen-bonding interactions are found responsible for the helical bias control in this C-3-symmetric gelator.</p>1 aMaity, Arunava1 aGangopadhyay, Monalisa1 aBasu, Arghya1 aAute, Sunil1 aBabu, Sukumaran, Santhosh1 aDas, Amitava  uhttps://library.ncl.res.in/content/counteranion-driven-homochiral-assembly-cationic-c-3-symmetric-gelator-through-ion-pair01705nas a2200181   4500008004100000245012300041210006900164260000800233300001400241490000700255520098100262100001801243700003301261700003801294700003101332700003001363856013001393       2017                        eng d00aCascade energy transfer and tunable emission from nanosheet hybrids: locating acceptor molecules through chiral doping0 aCascade energy transfer and tunable emission from nanosheet hybr  cJUL  a7072-70750 v533 aLight harvesting donor-acceptor assemblies are indispensable to efficiently tap photons. In an attempt to improve the light harvesting efficiency of an acceptor doped assembly, we design and synthesize a donor-acceptor-donor triad which exhibits an exceptional intramolecular energy transfer with excellent efficiency. Moreover, a facile cascade energy transfer (energy funnelling) is observed in the presence of a series of second acceptors (63-91% efficiency) with tunable emission colours. Self-assembled nanosheets formed by the triad in the presence of acceptors exhibit cascade energy transfer assisted tunable emission. In addition, use of chiral acceptors induces chirality to the triad and results in the formation of chiral nanosheets alongwith cascade energy transfer. Here chiral induction, nanosheet formation and cascade energy transfer in the presence of chiral acceptors are used as tools to probe the intercalation of acceptor molecules in the donor scaffold.1 aGoudappagouda1 aWakchaure, Vivek, Chandrakan1 aRanjeesh, Kayaramkodath, Chandran1 aAbhai, Chalona, Antony Ral1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/cascade-energy-transfer-and-tunable-emission-nanosheet-hybrids-locating-acceptor-molecules02530nas a2200409   4500008004100000022001400041245011800055210006900173260000800242490000700250520127700257653001301534653003001547653001401577653001501591653000801606653001001614653001801624653001601642653001901658653001901677653002101696653001001717653002301727653001401750100003001764700001901794700001801813700001901831700001901850700002401869700001701893700002701910700003001937700002801967856012501995       2017                        eng d  a0947-653900aMixed-stack charge transfer crystals of pillar[5]quinone and tetrathiafulvalene exhibiting ferroelectric features0 aMixedstack charge transfer crystals of pillar5quinone and tetrat  cSEP0 v233 a<p><span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; background-color: rgb(248, 248, 248);">Ferroelectric materials find extensive applications in the fabrication of compact memory devices and ultra-sensitive multifunctional detectors. Face-to-face alternate stacking of electron donors and acceptors effectuate long-range unidirectional ordering of charge-transfer (CT) dipoles, promising tunable ferroelectricity. Herein we report a new TTF-quinone system-an emerald green CT complex consisting pillar[5]quinone (P5Q) and tetrathiafulvalene (TTF). The CT crystals, as determined by single crystal synchrotron X-ray diffraction, adopt a 1:1 mixed-stack arrangement of donor and acceptor with alternating dimers of TTF and 1,4-dioxane encapsulated P5Q. The TTF-P5Q.dioxane crystal possesses a macroscopic polarization axis giving rise to ferroelectricity at room temperature. The CT complex manifests ferroelectric features such as optical polarization rotation, temperature-dependent phase transition and piezoelectric response in single crystals. Ferroelectric behavior observed in P5Q-based CT complex widens the scope for further work on this structurally intriguing and readily accessible cyclic pentaquinone.</span></p>10aAcceptor10aCharge-transfer complexes10aChemistry10aConductors10aDDQ10aDonor10aferroelectric10aMacrocycles10aOrganic Metals10aPi-interaction10aPillar[5]quinone10asalts10aTransfer Complexes10aTransport1 aShivakumar, Kilingaru, I.1 aSwathi, Kadaba1 aGoudappagouda1 aDas, Tamal, C.1 aKumar, Ashwani1 aMakde, Ravindra, D.1 aVanka, Kumar1 aNarayan, Kavassery, S.1 aBabu, Sukumaran, Santhosh1 aSanjayan, Gangadhar, J.  uhttps://library.ncl.res.in/content/mixed-stack-charge-transfer-crystals-pillar5quinone-and-tetrathiafulvalene-exhibiting01215nas a2200193   4500008004100000022001400041245011200055210006900167260000800236300001200244490000700256520050900263100002100772700002100793700002400814700003000838700002800868856012500896       2018                        eng d  a1359-734500aConducting nanofibres of solvatofluorochromic cyclohexanetrione-dithiolylidene-based C-3 symmetric molecule0 aConducting nanofibres of solvatofluorochromic cyclohexanetrioned  cJAN  a212-2150 v543 a<p>We report a novel set of easily tailorable C-3 symmetric molecules with a pi-extended core and adorned with different thioalkyl groups, exhibiting solvatofluorochromic and amphoteric redox behaviour. The nearly planar core exhibits intermolecular face-to-face pi-stacking, S...S and intramolecular S...O interactions. Current-sensing atomic force microscopy studies revealed a high conductivity of similar to 0.15 mS cm(-1) in the undoped J-aggregate nanofibres of the thiopropyl appended gelator.</p>1 aShivakumar, K.I.1 a., Goudappagouda1 aGonnade, Rajesh, G.1 aBabu, Sukumaran, Santhosh1 aSanjayan, Gangadhar, J.  uhttps://library.ncl.res.in/content/conducting-nanofibres-solvatofluorochromic-cyclohexanetrione-dithiolylidene-based-c-301605nas a2200205   4500008004100000022001400041245008900055210006900144260000800213520090400221653001001125653001801135653002401153653001101177653001201188100003301200700001501233700003001248856012101278       2019                        eng d  a2192-650600aBoron-conjugated pyrenes as fluorescence-based molecular probes and security markers0 aBoronconjugated pyrenes as fluorescencebased molecular probes an  cJUL3 a<p>Boron-embedded aromatic hydrocarbons are a class of molecules known for their distinct electronic and/or optoelectronic properties and are thus suitable for many potential applications. Among those, boronic ester and acid containing molecules have been widely used for sensing and molecular recognition applications, respectively. We compared the sensing and molecular recognition properties of two boron-containing pyrene derivatives for fluoride and glucose sensing applications. The presence of four boronate ester groups enabled fluoride ion sensing at the mu M level. The boronic acid derivative is very selective towards glucose compared to other saccharides. Furthermore, we used the mechano-responsive fluorescence changes and self-assembly of these derivatives, respectively, for fluorescence-based inkless and ink (water)-based writing in invisible security labeling applications.</p>
10aboron10acarbohydrates10amechanoluminescence10apyrene10asensors1 aWakchaure, Vivek, Chandrakan1 aDas, Tamal1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/boron-conjugated-pyrenes-fluorescence-based-molecular-probes-and-security-markers00987nas a2200193   4500008004100000022001400041245014700055210006900202260000900271300001400280490000700294520021000301100001800511700003300529700003800562700003100600700003000631856013200661       2019                        eng d  a1359-734500aCascade energy transfer and tunable emission from nanosheet hybrids: locating acceptor molecules through chiral doping (vol 53, pg 7072, 2017)0 aCascade energy transfer and tunable emission from nanosheet hybr  cJUN   a6462-64620 v553 a<p>Correction for `Cascade energy transfer and tunable emission from nanosheet hybrids: locating acceptor molecules through chiral doping' by Goudappagouda et al., Chem. Commun., 2017, 53, 7072-7075.</p>
1 aGoudappagouda1 aWakchaure, Vivek, Chandrakan1 aRanjeesh, Kayaramkodath, Chandran1 aAbhai, Chalona, Antony Ral1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/cascade-energy-transfer-and-tunable-emission-nanosheet-hybrids-locating-acceptor-molecules-002445nas a2200217   4500008004100000245009700041210006900138260000800207300001400215490000700229520166200236100003301898700000501931700001801936700003801954700002301992700002602015700003402041700003002075856012202105       2019                        eng d00aCharge transfer liquid: a stable donor-acceptor interaction in the solvent-free liquid state0 aCharge transfer liquid a stable donoracceptor interaction in the  cAUG  a9371-93740 v553 a<p><span class="hitHilite">Charge</span>-<span class="hitHilite">transfer</span> complexes have been an inspiration to develop many functional soft materials. However, most of those studies have focused on solution based assemblies wherein <span class="hitHilite">the</span> explicit control of solvents and their polarity are crucial. <span class="hitHilite">In</span> this context, we explore an efficient and <span class="hitHilite">stable</span> <span class="hitHilite">charge</span> <span class="hitHilite">transfer</span> <span class="hitHilite">liquid</span> using <span class="hitHilite">a</span> <span class="hitHilite">solvent-free</span> <span class="hitHilite">liquid</span> dialkoxynaphthalene donor and <span class="hitHilite">a</span> naphthalenediimide acceptor. It has been observed that irrespective of <span class="hitHilite">the</span> <span class="hitHilite">donor-acceptor</span> ratio, <span class="hitHilite">the</span> <span class="hitHilite">charge</span>-<span class="hitHilite">transfer</span> <span class="hitHilite">liquid</span> exhibited an unprecedented stability and retained characteristic features even at increased temperatures. <span class="hitHilite">The</span> underlying intermolecular interactions leading to efficient CT have been examined by NMR techniques together with theoretical modelling studies. <span class="hitHilite">The</span> concept of <span class="hitHilite">charge</span> <span class="hitHilite">transfer</span> <span class="hitHilite">liquid</span> will be highly beneficial for <span class="hitHilite">the</span> development of processable optoelectronically active materials.<br />
	&nbsp;</p>
1 aWakchaure, Vivek, Chandrakan1 a1 aGoudappagouda1 aRanjeesh, Kayaramkodath, Chandran1 aChakrabarty, Suman1 aRavindranathan, Sapna1 aRajamohanan, Pattuparambil, R1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/charge-transfer-liquid-stable-donor-acceptor-interaction-solvent-free-liquid-state00942nas a2200193   4500008004100000022001400041245013500055210006900190260000900259300000900268490000700277520020700284100003000491700001800521700002400539700003000563700002800593856012700621       2019                        eng d  a1359-734500aConducting nanofibres of solvatofluorochromic cyclohexanetrione-dithiolylidene-based C-3 symmetric molecule (vol 54, pg 212, 2018)0 aConducting nanofibres of solvatofluorochromic cyclohexanetrioned  cJUN   a64610 v553 a<p>Correction for `Conducting nanofibres of solvatofluorochromic cyclohexanetrione-dithiolylidene-based C-3 symmetric molecule' by Kilingaru I. Shivakumar et al., Chem. Commun., 2018, 54, 212-215.</p>
1 aShivakumar, Kilingaru, I.1 aGoudappagouda1 aGonnade, Rajesh, G.1 aBabu, Sukumaran, Santhosh1 aSanjayan, Gangadhar, J.  uhttps://library.ncl.res.in/content/conducting-nanofibres-solvatofluorochromic-cyclohexanetrione-dithiolylidene-based-c-3-002056nas a2200241   4500008004100000022001400041245009200055210006900147260000800216300001600224490000800240520121300248100003801461700002601499700002901525700001801554700003301572700001801605700001501623700002401638700003001662856012201692       2019                        eng d  a0002-786300aImidazole-linked crystalline two-dimensional polymer with ultrahigh proton-conductivity0 aImidazolelinked crystalline twodimensional polymer with ultrahig  cSEP  a14950-149540 v1413 a<p>Proton-exchange membrane fuel cells are promising energy devices for a sustainable future due to green features, high power density, and mild operating conditions. A facile proton-conducting membrane plays a pivotal role to boost the efficiency of fuel cells, and hence focused research in this area is highly desirable. Major issues associated with the successful example of Nafion resulted in the search for alternate proton conducting materials. Even though proton carrier loaded crystalline porous organic frameworks have been used for protonconduction, the weak host-guest interactions limited their practical use. Herein, we developed a crystalline 2D-polymer composed of benzimidazole units as the integral part, prepared by the condensation of aryl acid and diamine in polyphosphoric acid medium. The imidazole linked-2D-polymer exhibits ultrahigh proton conductivity (3.2 X 10(-2) S cm(-1)) (at 95% relative humidity and 95 degrees C) in the pristine state, which is highest among the undoped porous organic frameworks so far reported. The present strategy of a crystalline proton-conducting 2D-polymer will lead to the development of new high performing crystalline solid proton conductor.</p>
1 aRanjeesh, Kayaramkodath, Chandran1 aIlathvalappil, Rajith1 aVeer, Sairam, Dnyaneshwa1 aPeter, Joseph1 aWakchaure, Vivek, Chandrakan1 aGoudappagouda1 aRaj, Vipin1 aKurungot, Sreekumar1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/imidazole-linked-crystalline-two-dimensional-polymer-ultrahigh-proton-conductivity01732nas a2200181   4500008004100000022001400041245009600055210006900151260000900220300001600229490000600245520108200251100002501333700002401358700001501382700003001397856012301427       2020                        eng d  a2050-748800aDual mode selective detection and differentiation of TNT from other nitroaromatic compounds0 aDual mode selective detection and differentiation of TNT from ot  cJUN   a10767-107710 v83 a<p>Selective detection of explosives, especially TNT, is a highly desirable area of research and various explosives detection devices including fluorescent sensors are already in place. However, multi-mode sensors will be more useful and reliable than conventional fluorescent ``Turn Off'' sensors. One of the challenges is the development of selective sensors to prevent illegal transport of commonly used explosive TNT through on-the-spot analysis. In this context, we report a fluorescent polymer-based selective detection of TNT using both fluorometric and colorimetric signals. In addition, colorimetric differentiation of TNT from other nitroaromatic compounds is made possible by complexing with various amines. Even though many other sensors are available for TNT, the current demonstration is unique in terms of selectivity, sensitivity, reliability, portability, and rapidity of results. The as-developed explosive detection kit can be useful in both civilian and military operations to trace the illegal transport of TNT as well as for post-explosion analysis.</p>
1 aPatil, Goudappagouda1 aDongre, Sangram, D.1 aDas, Tamal1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/dual-mode-selective-detection-and-differentiation-tnt-other-nitroaromatic-compounds02111nas a2200301   4500008004100000022001400041245007700055210006900132260000800201300001600209490000700225520116400232653001401396653001301410653002001423653003001443653001601473100002601489700001801515700002901533700003101562700001801593700002401611700002401635700002301659700003001682856009701712       2020                        eng d  a1433-785100aSelf-assembled helical arrays for the stabilization of the triplet state0 aSelfassembled helical arrays for the stabilization of the triple  cJUL  a13079-130850 v593 a<p>Room-temperature phosphorescence of metal and heavy atom-free organic molecules has emerged as an area of great potential in recent years. A rational design played a critical role in controlling the molecular ordering to impart efficient intersystem crossing and stabilize the triplet state to achieve room-temperature ultralong phosphorescence. However, in most cases, the strategies to strengthen phosphorescence efficiency have resulted in a reduced lifetime, and the available nearly degenerate singlet-triplet energy levels impart a natural competition between delayed fluorescence and phosphorescence, with the former one having the advantage. Herein, an organic helical assembly supports the exhibition of an ultralong phosphorescence lifetime. In contrary to other molecules, 3,6-phenylmethanone functionalized 9-hexylcarbazole exhibits a remarkable improvement in phosphorescence lifetime (&gt;4.1 s) and quantum yield (11 %) owing to an efficient molecular packing in the crystal state. A right-handed helical molecular array act as a trap and exhibits triplet exciton migration to support the exceptionally longer phosphorescence lifetime.</p>
10acarbazole10ahelicity10aphenylmethanone10aultralong phosphorescence10awaveguiding1 aNidhankar, Aakash, D.1 aGoudappagouda1 aKumari, Divya, S. Mohana1 aChaubey, Shailendra, Kumar1 aNayak, Rashmi1 aGonnade, Rajesh, G.1 aKumar, G., V. Pavan1 aKrishnan, Retheesh1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/self-assembled-helical-arrays-stabilization-triplet-state01896nas a2200241   4500008004100000022001400041245011600055210006900171260000800240300001100248490000800259520107900267653001301346653001701359653002001376653001901396100001801415700001801433700001801451700002301469700003001492856013201522       2020                        eng d  a0143-720800aTuning phosphorescence features of triphenylamines by varying functional groups and intermolecular interactions0 aTuning phosphorescence features of triphenylamines by varying fu  cFEB  a1079310 v1733 a<p>Organic room temperature phosphorescent materials are known for their synthetic feasibility, tunable phosphorescence wavelength and lifetime, etc. Hence new design strategies have been applied on various fluorophores to improve phosphorescence features. Among those, triphenylamines are phosphorescence active due to the presence of nitrogen atom, propeller molecular structure, and intermolecular interactions in the crystal state. Here we have studied the room temperature phosphorescence of a series of triphenylamines with various functional groups. Detailed studies have shown that the phosphorescence can be fine-tuned by functional group modification. A long phosphorescence lifetime around 100 ms at room temperature in air can be achieved by the interplay of intermolecular interactions, singlet-triplet energy gap and extent of intersystem crossing using functional group variation. Interestingly, an exciplex assisted ultralong phosphorescence lifetime (more than 20 times) is observed for a combination of triphenylamine and naphthalenemonoimide in air.</p>
10aExciplex10afluorescence10aPhosphorescence10atriphenylamine1 aGoudappagouda1 aAsokan, Kiran1 aNayak, Rashmi1 aKrishnan, Retheesh1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/tuning-phosphorescence-features-triphenylamines-varying-functional-groups-and-intermolecular01590nas a2200181   4500008004100000022001400041245007400055210006900129260000900198300001400207490000700221520098100228100001801209700002601227700002201253700003001275856010301305       2021                        eng d  a1477-052000aAggregation-induced phosphorescence of an anthraquinone based emitter0 aAggregationinduced phosphorescence of an anthraquinone based emi  cFEB   a1004-10080 v193 a<p>Room temperature phosphorescence (RTP) of metal-free organic molecules is a hot topic of current research interest. RTP can be enhanced through aggregation, crystallization, and the support of polymers and host-guest assemblies. The characteristics of highly phosphorescent aggregates formed from conventional chromophores make them ideal candidates for many potential applications. In this direction, we focused on the aggregation-induced phosphorescence of an anthraquinone derivative AqC6 in solution and in crystal state. The weakly emissive dilute solution exhibits a tunable emission with enhanced intensity and room temperature phosphorescence by increasing the concentration and solvent-antisolvent combination. The enhanced phosphorescence of crystals has been recreated in the solution by making use of aggregation. Interestingly, the support of PMMA enabled AqC6 to achieve enhanced processability, phosphorescence lifetime (174 ms) and quantum yield (5%).</p>
1 aGoudappagouda1 aNidhankar, Aakash, D.1 aNayak, Rashmi, A.1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/aggregation-induced-phosphorescence-anthraquinone-based-emitter01964nas a2200253   4500008004100000022001400041245011500055210006900170260000800239300001400247490000700261520109300268653001501361653001801376653001401394653001801408653002001426100003801446700001801484700002201502700002601524700003001550856013001580       2021                        eng d  a1867-388000aDurable metalloporphyrin 2D-polymer for photocatalytic hydrogen and oxygen evolution from river and sea waters0 aDurable metalloporphyrin 2Dpolymer for photocatalytic hydrogen a  cAPR  a1717-17210 v133 a<p>It is highly imaginary that the outcome of a combination of two complementary resources leads to answer an alarming global issue. One such possible example is the solar seawater splitting for `clean fuel' H-2 generation. Since the catalytic activity and stability of the photocatalysts are substantially challenged in seawater, the design of an efficient and stable photocatalyst is highly desirable. Herein, we demonstrate the solar seawater splitting by a two-dimensional polymer catalyst derived from metalloporphyrin bearing multi-hydroxyl groups. A bimetallic (Co and Ni) porphyrin 2D-polymer exhibits excellent long-term durability of 15 cycles of H-2 and O-2 generation in 200 days from pure water without a considerable decrease in efficiency. Detailed studies using river and seawaters also show the reliable performance of the catalyst over repeated cycles. Here the deactivation modes of catalytic activity have been nullified by the layered metalloporphyrin polymer structure through stable pi-pi stacking, signifying the molecular design of 2D-polymer photocatalyst.</p>
10a2D-polymer10aPhotocatalyst10aporphyrin10aSelf-assembly10awater splitting1 aRanjeesh, Kayaramkodath, Chandran1 aGeorge, Leena1 aMaibam, Ashakiran1 aKrishnamurty, Sailaja1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/durable-metalloporphyrin-2d-polymer-photocatalytic-hydrogen-and-oxygen-evolution-river-and02006nas a2200181   4500008004100000022001400041245006000055210005900115260000800174300001400182490000700196520142700203100002601630700001801656700002501674700003001699856009501729       2021                        eng d  a2041-652000aEfficient metal-free organic room temperature phosphors0 aEfficient metalfree organic room temperature phosphors  cMAR  a4216-42360 v123 a<p>An innovative transformation of organic luminescent materials in recent years has realised the exciting research area of ultralong room-temperature phosphorescence. Here the credit for the advancements goes to the rational design of new organic phosphors. The continuous effort in the area has yielded wide varieties of metal-free organic systems capable of extending the lifetime to several seconds under ambient conditions with high quantum yield and attractive afterglow properties. The various strategies adopted in the past decade to manipulate the fate of triplet excitons suggest a bright future for this class of materials. To analyze the underlying processes in detail, we have chosen high performing organic triplet emitters that utilized the best possible ways to achieve a lifetime above one second along with impressive quantum yield and afterglow properties. Such a case study describing different classes of metal-free organic phosphors and strategies adopted for the efficient management of triplet excitons will stimulate the development of better candidates for futuristic applications. This Perspective discusses the phosphorescence features of single- and multi-component crystalline assemblies, host-guest assemblies, polymers, and polymer-based systems under various classes of molecules. The various applications of the organic phosphors, along with future perspectives, are also highlighted.</p>1 aNidhankar, Aakash, D.1 aGoudappagouda1 aWakchaure, Vivek, C.1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/efficient-metal-free-organic-room-temperature-phosphors01938nas a2200193   4500008004100000022001400041245012200055210006900177260000800246300001600254490000700270520121800277100003301495700001801528700001501546700002601561700003001587856012701617       2021                        eng d  a2040-336400aExcimer to exciplex transition through realization of donor-acceptor interactions in luminescent solvent-free liquids0 aExcimer to exciplex transition through realization of donoraccep  cJUN  a10780-107840 v133 aLuminescent solvent-free organic liquids are known for their enhanced quantum yield, color tunability, and availability of a matrix for other dopants to generate hybrid luminescent materials with improved features for newer applications. Herein, we report a donor-acceptor based luminescent ``exciplex liquid'' by utilizing the slightly different electron affinity of the acceptor molecules. A red-shifted broad exciplex emission exhibited by the donor-acceptor pair even at a lower concentration of the acceptor (0.001 equiv.) indicates high efficiency in the solvent-free state. A detailed NMR study revealed weak intermolecular interactions between the donor and acceptor in the solvent-free matrix that stabilizes the exciplex liquid. The failure of structurally similar solid counterparts to form an exciplex confirms the advantage of the available supportive liquid matrix. Besides, the luminescent exciplex liquid is found efficient in sensing application, which is unachievable by either the individual liquids or their solid counterparts. Here, a transition of a donor-acceptor pair from a solid to solvent-free liquid results in a new hybrid liquid that can be an alternative for solid sensor materials.1 aWakchaure, Vivek, Chandrakan1 aGoudappagouda1 aDas, Tamal1 aRavindranathan, Sapna1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/excimer-exciplex-transition-through-realization-donor-acceptor-interactions-luminescent01605nas a2200229   4500008004100000022001400041245012100055210006900176260000900245300001400254490000700268520078700275100003301062700002101095700002601116700001801142700001801160700001801178700002601196700003001222856012301252       2022                        eng d  a1359-734500aDonor-acceptor based solvent-free organic liquid hybrids with exciplex emission and room temperature phosphorescence0 aDonoracceptor based solventfree organic liquid hybrids with exci  cFEB   a1998-20010 v583 aSolvent-free organic liquids are well-known for their excellent luminescence features. Hence, the recent developments in this area have marked them as potential emitters with high quantum yield and enhanced processability. The support of an available liquid matrix enables doping to deliver hybrid liquids with intriguing luminescence features. In this direction, we report solvent-free liquid donor-acceptor pairs with exciplex emission and room temperature phosphorescence at very low acceptor loading. The underlying weak intermolecular interactions have been revealed by 2D NMR techniques and theoretical calculations. The formation of large-area thin films by exciplex and phosphorescent liquid hybrids will encourage the development of scalable lighting and display materials.1 aWakchaure, Vivek, Chandrakan1 aVeer, Sairam, D.1 aNidhankar, Aakash, D.1 aGoudappagouda1 aNayak, Rashmi1 aAsokan, Kiran1 aRavindranathan, Sapna1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/donor-acceptor-based-solvent-free-organic-liquid-hybrids-exciplex-emission-and-room02005nas a2200241   4500008004100000022001400041245011700055210006900172260000800241300001500249490000600264520116300270653001401433653002001447653001401467653002001481653002501501100002901526700002701555700003001582700002101612856013001633       2022                        eng d  a2365-654900aHighly efficient and reusable polymer supported palladium catalyst for copper free sonogashira reaction in water0 aHighly efficient and reusable polymer supported palladium cataly  cAPR  ae2021042730 v73 a<p>
	Development of a novel, greener and efficient heterogeneous catalytic system for copper free Sonogashira reaction in water is described. This novel catalyst can be easily prepared by a simple method through synthetic modification of nitrile group in Polyacrylonitrile (PAN) using monoethanolamine (MEA) followed by its complexation with palladium chloride (PdCl2). The resulting polymer Pd complex (mPAN-Pd) was characterized by means of Fourier Transform Infrared Spectroscopy (FTIR), Energy-Dispersive X-ray Spectroscopy (EDAX), Inductively Coupled Mass Spectrometry (ICP-MS) and X-ray Photo Electron Spectroscopy (XPS) analyses. mPAN-Pd was then explored as highly efficient heterogeneous catalyst for Sonogashira coupling reaction under copper and ligand free conditions in water affording the corresponding coupling products up to 97 % isolated yield. Moreover, the catalyst was recovered by simple filtration after the reaction and reused for next 5 cycles with excellent stability and activity. This is the first report on the use of ethanolamine modified PAN Pd (II) complex as an efficient heterogeneous catalyst for a coupling reaction.</p>
10acatalysis10agreen chemistry10aPalladium10aPolymer Support10aSonogashira coupling1 aSruthi, Pambingal, Rajan1 aNimmi, Puthan, Purayil1 aBabu, Sukumaran, Santhosh1 aAnas, Saithalavi  uhttps://library.ncl.res.in/content/highly-efficient-and-reusable-polymer-supported-palladium-catalyst-copper-free-sonogashira02376nas a2200217   4500008004100000022001400041245010500055210006900160260000900229300001400238490000700252520160400259100002901863700002001892700002601912700002001938700002201958700002401980700003002004856012402034       2023                        eng d  a2052-412900aDonor strapped perylene bisimide macrocycle and its lemniscate dimer with extended charge separation0 aDonor strapped perylene bisimide macrocycle and its lemniscate d  cOCT   a5099-51070 v103 a<p>
	Macrocyclic structures are fascinating due to their unique design and capability to place chromophores in specific orientations, resulting in exciting optoelectronic properties. However, the synthetic challenges limit the broad exploration of such systems. Herein, we report a thiophene-diacetylene-based ring strapped perylene bisimide macrocycle and its notably different electron transfer features. Single-crystal analysis of the macrocycle pointed to the nearly orthogonal placement of donor-acceptor units, facilitating better electronic communication between them. Interestingly, introduction of an alkyl substituent on the peripheral thiophene ring opened the possibility of forming a higher oligomer macrocycle consisting of two strapped perylene bisimide units. Diffusion and two-dimensional NMR experiments provided insight into the structure of the figure-eight-shaped lemniscate dimer. Transient absorption measurements showed faster electron transfer and extended stabilization of the charge-separated state. The thiophene-diacetylene-based ring is a better donor unit to facilitate rapid electron transfer and extended charge separation in the macrocycle and its lemniscate dimer. The new macrocycle design enables the formation of higher analogs equally capable of stabilizing the charge-separated state. Donor-acceptor (D-A) macrocycle designs position the respective units to achieve ultrafast electron transfer precisely and an extended charge-separated state. Here, we report a D-A macrocycle and its lemniscate dimer molecule with exciting electron transfer features.</p>
1 aVeer, Sairam, Dnyaneshwa1 aGoswami, Tanmay1 aRavindranathan, Sapna1 aGonnade, Rajesh1 aKharbanda, Nitika1 aGhosh, Hirendra, N.1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/donor-strapped-perylene-bisimide-macrocycle-and-its-lemniscate-dimer-extended-charge02016nas a2200205   4500008004100000022001400041245010700055210006900162260000900231300001600240490000700256520126800263100002301531700004001554700001801594700001801612700001801630700003001648856013201678       2023                        eng d  a1144-054600aDonor-acceptor-based two-dimensional polymer as a supercapacitor electrode with long cycling stability0 aDonoracceptorbased twodimensional polymer as a supercapacitor el  cOCT   a18049-180540 v473 a<p>
	The high demand for energy and energy-storage devices urged organic 2D polymers as a potential candidate in this area. One of the major attractions of 2D polymers in electrochemical applications is their long cycling stability due to their rigid and porous structure. Herein, we developed a 2D polymer comprised of donor-acceptor units exhibiting reasonably good performance as a supercapacitor. The 2D polymer displayed a maximum specific capacitance of 218 F g-1 at a current rate of 0.1 A g-1, a higher power density of 4648.35 W kg-1, and an energy density of 7.05 W h kg-1. In a cycling stability test, it demonstrated a capacitance retention of 70% over 10 000 continuous charge-discharge cycles at a current rate of 2.5 A g-1. Such long cycling stability was attributed to the donor-acceptor units and the crystalline nature of the polymer. The sensible selection of the building blocks of the 2D polymers is crucial for the performance and hence provides scope for improvement. An organic donor-acceptor-based 2D polymer, a promising candidate for energy storage devices, displays a specific capacitance of 218 F g-1, a power density of 4648.35 W kg-1, an energy density of 7.05 W h kg-1, and a capacitance retention of 70% over 10 000 cycles.</p>
1 aBhagyasree, T., M.1 aPuthiyaveetil, Priyanka, Pandinhare1 aKumar, Viksit1 aAsokan, Kiran1 aSreekumar, K.1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/donor-acceptor-based-two-dimensional-polymer-supercapacitor-electrode-long-cycling-stability02651nas a2200205   4500008004100000022001400041245011100055210006900166260000900235300001600244490000700260520190600267653001802173653003002191100002202221700002302243700001702266700003002283856013202313       2023                        eng d  a2050-752600aFunctionalized CNT-azobenzene-PVA-based self-healing aqueous gel as a conductive photo-responsive actuator0 aFunctionalized CNTazobenzenePVAbased selfhealing aqueous gel as   cDEC   a16571-165770 v113 a<p>Conductive gels have gained attention from researchers owing to potential applications in flexible displays, implantable medical devices, touch panels, wearable electronic skin, sensors, soft robotics, etc. Photo-responsive conductance switching gels can make their way into various applications, including contact-free remote-controlled manipulation of the materials, implantable synthetic organs, and optical switches. Herein, we report an aqueous gel with boronic acid containing azobenzene crosslinker as the light-responsive part that can undergo reversible cis-trans isomerization on irradiation with UV-vis light and catechol functionalized single-walled carbon nanotube as a conductive part producing a self-healing aqueous gel with PVA. The 3D crosslinked gel network formed through the formation of boronic ester and hydrogen bonding between hydroxyl and boronic acid groups was confirmed using scanning electron microscopy, X-ray microtomography, and rheological experiments. Rheology results show that gel is a viscoelastic material with immediate self-healing properties. The presence of functionalized SWCNT in the gel matrix enhances the stability and results in a conductivity of up to 3.5 S cm-1 with a loading of 5 wt%. The gel network exhibits a photoresponsive conductance switching from 10 to 60 mu A with UV and visible light irradiation, respectively. The molecular level motions during the isomerization of azobenzene lead to macroscopic dynamic changes that can find applications in soft actuators. The photoresponsive conductivity switching and dynamic movements of the films make the present material suitable for contact-free switching applications. Responsive conductive gels have gained attention owing to potential applications in flexible displays, implantable medical devices, touch panels, wearable electronic skin, sensors, soft robotics, and related areas.</p>
10aCyclodextrins10aSupramolecular Hydrogels,1 aNarayanan, Aswini1 aBhagyasree, T., M.1 aTorris, Arun1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/functionalized-cnt-azobenzene-pva-based-self-healing-aqueous-gel-conductive-photo-responsive02618nas a2200253   4500008004100000022001400041245008400055210007000139260000800209490000700217520178600224653001202010653001302022653001902035653001702054653003102071100001802102700002502120700002402145700002002169700003002189700003002219856011502249       2023                        eng d  a1433-785100aIsomer effect on energy storage of π-extended S-shaped double[6]heterohelicene0 aIsomer effect on energy storage of πextended Sshaped double6hete  cNOV0 v623 a<p>Recently, chiral and nonplanar cutouts of graphene have been the favorites due to their unique optical, electronic, and redox properties and high solubility compared with their planar counterparts. Despite the remarkable progress in helicenes, pi-extended heterohelicenes have not been widely explored. As an anode in a lithium-ion battery, the racemic mixture of pi-extended double heterohelical nanographene containing thienothiophene core exhibited a high lithium storage capability, attaining a specific capacity of 424 mAh g-1 at 0.1 A g-1 with excellent rate capability and superior long-term cycling performance over 6000 cycles with negligible fade. As a first report, the pi-extended helicene isomer (PP and MM), with the more interlayer distance that helps faster diffusion of ions, has exhibited a high capacity of 300 mAh g-1 at 2 A g-1 with long-term cycling performance over 1500 cycles compared to the less performing MP and PM isomer and racemic mixture (150 mAh g-1 at 2 A g-1). As supported by single-crystal X-ray analysis, a unique molecular design of nanographenes with a fixed (helical) molecular geometry, avoiding restacking of the layers, renders better performance as an anode in lithium-ion batteries. Interestingly, the recycled nanographene anode material displayed comparable performance. A pi-extended double heterohelical nanographene of thienothiophene core fused with two hexabenzocoronene units exhibits excellent performance as an anode in a lithium-ion battery. The isomer (PP and MM) with more interlayer distance exhibited a high lithium storage capability compared to the other isomer and racemic mixture. Helical nanographene anodes display excellent rate capability, superior long-term cycling performance, and recyclability.image</p>
10aBattery10agraphene10aLi-ion battery10ananographene10aOrganic Electrode Material1 aKumar, Viksit1 aBharathkumar, H., J.1 aDongre, Sangram, D.1 aGonnade, Rajesh1 aKrishnamoorthy, Kothandam1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/isomer-effect-energy-storage-%CF%80-extended-s-shaped-double6heterohelicene02177nas a2200253   4500008004100000022001400041245011800055210006900173260000800242490000700250520127800257653002001535653001901555653003301574653001401607653001601621100003301637700002901670700002601699700001801725700002201743700003001765856012801795       2023                        eng d  a1433-785100aPolymerizable solvent-free organic liquids: a new approach for large area flexible and foldable luminescent films0 aPolymerizable solventfree organic liquids a new approach for lar  cAUG0 v623 a<p>The high demand for light-emitting and display devices made luminescent organic materials as attractive candidates. Solvent-free organic liquids are one of the promising emitters among them due to the salient features. However, the inherent limitations of forming sticky and noncurable surfaces must be addressed to become an alternate emitter for large-area device applications. Herein, we functionalized solvent-free organic liquids having monomeric emission in bulk with polymerizable groups to improve the processability. The polymerizable group on carbazole, naphthalene monoimide, and diketopyrrolopyrrole-based solvent-free liquid emitters enabled on-surface polymerization. These emitters alone and in combinations can be directly coated on a glass substrate without the help of solvents. Subsequent photo or thermal polymerization leads to stable, non-sticky, flexible, foldable, and free-standing large-area films with reasonably high quantum yield. Our demonstration of the tunable and white light-emitting films using polymerizable solvent-free liquids might be a potential candidate in flexible/foldable/stretchable electronics. The new concept of polymerizable liquid can be extended to other functional features suitable for futuristic applications.</p>
10aEnergy Transfer10apolymerization10aSolvent-Free Organic Liquids10aThin-Film10aWhite Light1 aWakchaure, Vivek, Chandrakan1 aVeer, Sairam, Dnyaneshwa1 aNidhankar, Aakash, D.1 aKumar, Viksit1 aNarayanan, Aswini1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/polymerizable-solvent-free-organic-liquids-new-approach-large-area-flexible-and-foldable02132nas a2200301   4500008004100000022001400041245011400055210006900169260000900238490000700247520111200254653001601366653002001382653000901402653002001411653000901431100002901440700001801469700002901487700002401516700002901540700002501569700001801594700002501612700003101637700003001668856013201698       2023                        eng d  a1861-472800aThermally activated delayed fluorescent solvent-free organic liquid hybrids for tunable emission applications0 aThermally activated delayed fluorescent solventfree organic liqu  cJUL 0 v183 a<p>
	The synthetic feasibility and excellent luminescence features of organic molecules attracted much attention and were eventually found useful in lighting applications. In this context, a solvent-free organic liquid having attractive thermally activated delayed fluorescence features in bulk along with high processability has prime importance. Herein, we report a series of naphthalene monoimide-based solvent-free organic liquids exhibiting cyan to red thermally activated delayed fluorescence with luminescence quantum yields up to 80% and lifetimes between 10 to 45 mu s. An effective approach explored energy transfer between liquid donors with various emitters exhibiting tunable emission colors, including white. The high processability of liquid emitters improved the compatibility with polylactic acid and was used for developing multicolor emissive objects using 3D printing. Our demonstration of the thermally activated delayed fluorescence liquid will be much appreciated as a processable alternate emissive material suitable for large-area lighting, display, and related applications.</p>
10a3D printing10aEnergy Transfer10aOLED10aOrganic Liquids10aTADF1 aNidhankar, Aakash, D. D.1 aGoudappagouda1 aKothavade, Premkumar, D.1 aDongre, Sangram, D.1 aVeer, Sairam, Dnyaneshwa1 aDash, Soumya, Ranjan1 aRajeev, Kavya1 aUnni, K., N. Narayan1 aShanmuganathan, Kadhiravan1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/thermally-activated-delayed-fluorescent-solvent-free-organic-liquid-hybrids-tunable-emission03770nas a2200169   4500008004100000022001400041245010300055210006900158260000800227300001200235490000700247520312200254100003303376700003103409700003003440856013003470       2024                        eng d  a0001-484200aSolvent-free organic liquids: an efficient fluid matrix for unexplored functional hybrid materials0 aSolventfree organic liquids an efficient fluid matrix for unexpl  cFEB  a670-6840 v573 a<p>
	The invention of solvent-free organic liquids (SOLs) was serendipitous. However, the curiosity-driven research in the later stage delivered new soft materials with exciting optical, and optoelectronic properties along with appealing physical characteristics suitable for the futuristic applications. A slight change in the molecular design resulted in a drastic change in the physical state of molecules demonstrating monomer-like features in the bulk. The basic idea of core isolation has been successful in delivering new SOLs with attractive functional properties. The unique fluid matrix associated with SOLs offers a tremendous opportunity for making hybrid materials by simple mixing. The chance to study the fundamentally important electron transfer, energy transfer, charge transfer interactions, triplet-state emissions, and even detailed NMR experiments in the solvent-free neat state is the major attraction of SOLs. Usually, solvents and their polarity control such molecular properties, and in the case of SOLs, it avoids the use of solvents to study such fundamentally important properties. Besides, SOLs protect the triplet emitters and excited state processes involving triplet states from quenchers and make the analysis possible under ambient conditions. Our effort in this direction was focused on tuning the ground and excited state properties by transforming conventional organic molecules to SOLs and further value addition by preparing the hybrid SOLs. We developed a series of hybrid SOLs, exploring room-temperature phosphorescence, thermally activated delayed fluorescence, charge or energy transfer between donor and acceptor SOLs, selective explosive sensing, etc. A slight variation in the chemical structure or optoelectronic properties of the individual components imparted exciting optical features for the hybrid SOLs. It includes nonemissive charge transfer, tunable emission exciplex, room temperature phosphorescence, and thermally activated delayed fluorescence SOLs. The liquid matrix of donor SOLs accommodated varying amounts of acceptor SOLs to tune the ground and excited state features. In all examples of donor-acceptor-based hybrid SOLs, even a low amount of acceptor, such as a donor-acceptor ratio of 1000:1, can cause pronounced optical properties. Hence, the evaluation of the optical properties of SOLs, especially, in the absence of solvents is so special that it avoids the interference of solvent molecules. Still, the major drawback of SOLs remains unsolved until we report polymerizable SOLs. Although a large variety of SOLs have been reported in the literature, the long-lasting problem of surface stickiness of SOLs was resolved by polymerizable SOLs. It enabled the development of flexible, foldable, and stretchable large-area luminescent films suitable for lighting and display devices. In this Account, we summarize our work on SOLs, hybrid SOLs, polymerizable SOLs, and the application of SOLs in selective sensing of explosives. Finally, an outlook on the feasibility of luminescent polymerizable SOLs in futuristic applications is provided.</p>
1 aWakchaure, Vivek, Chandrakan1 aChannareddy, Goudappagouda1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/solvent-free-organic-liquids-efficient-fluid-matrix-unexplored-functional-hybrid-materials01511nas a2200193   4500008004100000022001400041245011000055210007000165260000900235300001600244490000700260520080300267100001801070700002401088700002201112700002201134700003001156856013101186       2024                        eng d  a1359-734500aTailoring helical ends of π-extended [6]heterohelicenes to control optical, and electrochemical features0 aTailoring helical ends of πextended 6heterohelicenes to control   cOCT   a11944-119470 v603 a<p>
	The inherent helical chirality and improved pi-stacking capabilities endow helicenes with fascinating photophysical characteristics when decorated with lateral pi-extensions. Here, we report the synthesis and physicochemical characterization of expanded hetero[6]helicenes fused with thiadiazole and selenadiazole rings at the helical ends. Comparing these heterohelicenes revealed the impact of the heteroatom-embedded aromatic rings on the excited state and redox features. A small structural variation of the terminal rings from thiadiazole to selenadiazole caused a striking change in the heterohelical nanographenes. The inherent helical chirality and improved pi-stacking capabilities endow helicenes with fascinating photophysical characteristics when decorated with heteroatoms.</p>
1 aKumar, Viksit1 aDongre, Sangram, D.1 aVenugopal, Geethu1 aNarayanan, Aswini1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/tailoring-helical-ends-%CF%80-extended-6heterohelicenes-control-optical-and-electrochemical01333nas a2200181   4500008004100000022001400041245007700055210007000132260000900202300001600211490000700227520071700234100002400951700001800975700001600993700003001009856011201039       2025                        eng d  a1523-706000aAccessing electron-deficient π-extended pyrenes via non-K-region fusion0 aAccessing electrondeficient πextended pyrenes via nonKregion fus  cNOV   a12270-122750 v273 a<p>
	This study presents a new class of pyrene derivatives featuring non-K-region fusion and electron-deficient pi-extension. By strategically introducing electron-withdrawing groups at the non-K positions, the optical and redox properties of these compounds were significantly altered. For the first time, we report a non-K-region fused acceptor pyrene with an extended pi-skeleton. The detailed characterizations revealed pronounced shifts in both absorption and emission spectra, accompanied by a significant lowering of the LUMO energy levels. Our results highlight non-K region-fused pyrenes as a promising building block for next-generation organic semiconductors with tunable electronic properties.</p>
1 aDongre, Sangram, D.1 aKumar, Viksit1 aKumar, Ravi1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/accessing-electron-deficient-%CF%80-extended-pyrenes-non-k-region-fusion01930nas a2200205   4500008004100000022001400041245007500055210006900130260000900199300001600208490000700224520124400231100001801475700002401493700002201517700003001539700001801569700003001587856010701617       2025                        eng d  a1948-718500a(Chiro)optical Properties of π-Extended Spiro-Double Carbo[7]helicene0 aChirooptical Properties of πExtended SpiroDouble Carbo7helicene  cNOV   a11657-116640 v163 a<p>
	Helical nanographenes are a fascinating class of pi-extended chiral nanocarbons, where structural helicity imparts intrinsic chirality and unique optoelectronic properties to the rigid carbon framework. In this work, we synthesized a hexa-peri-hexabenzocoronene-based pi-extended spiro-double carbo[7]helicene. The helical distortion of the structure was unambiguously confirmed by X-ray crystallography. The optical properties were explored through UV-Vis absorption, fluorescence, and phosphorescence measurements, complemented by density functional theory (DFT) calculations. Remarkably, the pi-extended spiro-double carbo[7]helicene exhibited thermally activated delayed fluorescence (TADF) at room temperature and phosphorescence at low temperatures. Chiral HPLC successfully resolved the enantiomers into three fractions: (PP), (MM), and the meso forms (PM)/(MP), and chiroptical studies of the pure enantiomers revealed a moderately high g lum value of 1.58 x 10-3. Finally, the origin of the observed dissymmetry factors was rationalized by analyzing the transition electric dipole moments (TEDM) and transition magnetic dipole moments (TMDM) derived from time-dependent density functional theory (TD-DFT) calculations.</p>
1 aKumar, Viksit1 aDongre, Sangram, D.1 aVandhanam, Aparna1 aJadhav, Ashok, Badrinaray1 aKumar, Jatish1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/chirooptical-properties-%CF%80-extended-spiro-double-carbo7helicene02168nas a2200253   4500008004100000245009100041210006900132260000900201300001500210490000700225520131300232653003801545653002301583653001301606653001701619653001801636100002401654700002201678700001801700700003001718700001801748700003001766856011801796       2025                        eng d00aChiroptical amplification of [7]-helicene nanographene by additional helical chirality0 aChiroptical amplification of 7helicene nanographene by additiona  cFEB   ae2024207670 v643 a<p>
	Nanographenes have captivated scientific interest since the pioneering discovery of graphene. Recently, attention has shifted towards exploring chiral and nonplanar nanographenes, for their distinct optical, chiroptical, and electronic properties. Despite the growing acceptance of helicenes, the research on inducing helical chirality on pi-extended derivatives to boost chiroptical properties remains unattended. In our study, we introduce a new pi-extended [7]-helicene resulting from the condensation of diamines with 3,6-dibromophenanthrene-9,10-dione, complemented by two hexabenzocoronene arms in the periphery. Notably, the nanographene containing binaphtho-[1,4]diazocine, compared to the corresponding phenazine, exhibits a remarkable average 2.5, 5, and 10-fold enhancements in quantum yield, dissymmetry factor, and brightness, respectively, when measured in five different solvents. These improvements underscore the significance of the induced helical chirality by the antiaromatic binaphtho-[1,4]diazocine in influencing the chiroptical properties of the helical nanographene. Our research represents a significant stride toward unlocking the potential of pi-extended helicenes and lays the groundwork for further exploration in designing and synthesizing new chiral nanomaterials.</p>
10acircularly polarised luminescence10adissymmetry factor10ahelicene10ananographene10aquantum yield1 aDongre, Sangram, D.1 aVenugopal, Geethu1 aKumar, Viksit1 aJadhav, Ashok, Badrinaray1 aKumar, Jatish1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/chiroptical-amplification-7-helicene-nanographene-additional-helical-chirality02212nas a2200277   4500008004100000022001400041245008600055210006900141260000800210300001200218490000700230520131600237653001601553653001401569653002201583653002101605653001101626100001801637700003401655700002001689700002201709700002601731700003001757700003001787856011701817       2025                        eng d  a1613-681000aDiamondoid all-carbon porous aromatic framework host for lithium-sulfur batteries0 aDiamondoid allcarbon porous aromatic framework host for lithiums  cJUN  a25003880 v213 a<p>
	Lithium-sulfur batteries (LSBs) hold incredible potential as next-generation energy storage systems. However, practical applications of LSBs are significantly hindered by several critical challenges. For the first time, scalable all-carbon porous 3D polymers (3DPs) that do not contain heteroatoms or functional groups and do not require post-functionalization are investigated as hosts in lithium-sulfur batteries, demonstrating enhanced cycling stability and overall battery performance. The pyrene-containing 3DP exhibits 75% capacity retention after 600 cycles at 1 C and 52% capacity retention after 1300 cycles at 0.2 C, better than phenyl comprising 3DP. Furthermore, even at higher sulfur loading (4.1 mg cm(-2)) with an electrolyte/sulfur ratio of 5 mu L mg(-1), pyrene 3DP displayed a high capacity of 600 mA h g(-1) and stable performance over 250 cycles with negligible capacity fade. The defined pore structure of 3DPs prevents the migration of polysulfides through physical confinement and the large pi -clouds of 3DPs interact with the negative charge-bearing polysulfides generated in charge-discharge cycles through anion-pi interaction. In this way, The design ensures that the host 3DPs interact with neutral sulfur and anionic polysulfides, resulting in an excellent performance.</p>
10a3D polymers10aBatteries10aLi-Sulfur battery10aporous materials10apyrene1 aKumar, Viksit1 aJavaregowda, Bharathkumar, H.1 aDevasia, George1 aNarayanan, Aswini1 aKrishnamurty, Sailaja1 aKrishnamoorthy, Kothandam1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/diamondoid-all-carbon-porous-aromatic-framework-host-lithium-sulfur-batteries01458nas a2200253   4500008004100000022001400041245013900055210006900194260000800263300001400271490000700285520055800292100002400850700002800874700001900902700002000921700002300941700002200964700002300986700003001009700002101039700001801060856012601078       2025                        eng d  a1359-734500aMultifunctional luminogens with synergy of aggregation-induced delayed fluorescence, two-photon absorption and photocurrent generation0 aMultifunctional luminogens with synergy of aggregationinduced de  cJAN  a1447-14500 v613 a<p>
	In this study, we investigated the aggregation-induced delayed fluorescence (AIDF) properties of three luminogens - TN, TA, and TP. Our comprehensive theoretical analysis reveals a significant reduction in the Delta EST in their aggregated or solid-state, activating TADF, on a similar to mu s time-scale. Additionally, these luminogens demonstrate two-photon excited anti-Stokes photoluminescence emission and improved photocurrent generation, attributed to their strong charge transfer characteristics and longer singlet exciton lifetimes.</p>
1 aChatterjee, Abhijit1 aNarayanan, Sundaravalli1 aThorat, Sachin1 aMalik, Ajay, J.1 aAmbhore, Madan, D.1 aNarayanan, Aswini1 aSihag, Anil, Kumar1 aBabu, Sukumaran, Santhosh1 aLahiri, Mayurika1 aHazra, Partha  uhttps://library.ncl.res.in/content/multifunctional-luminogens-synergy-aggregation-induced-delayed-fluorescence-two-photon02407nas a2200313   4500008004100000245008500041210007000126260000800196300001500204490000700219520144500226653001401671653000801685653001401693653001701707653002001724653000901744100001801753700002201771700003001793700002401823700002001847700001801867700001901885700001901904700002101923700003001944856011901974       2025                        eng d00aRegioisomeric π-extended nanographene with long-lived phosphorescence afterglow0 aRegioisomeric πextended nanographene with longlived phosphoresce  cFEB  ae2024221250 v643 a<p>
	The cutouts of graphene sheets, particularly those with a nonplanar topology, present vast opportunities for advancement. Even a slight deviation from the planar structure can lead to intriguing (chiro)optical features for helically twisted nanographenes. In this context, we introduce two regioisomeric pi-extended nanographenes that exhibit distinct excited-state characteristics. The helicene structure and the photophysical features can be easily tuned by changing the connecting position of the nanographene to the carbazole core (2,7- and 3,6-). Single-crystal X-ray diffraction analysis confirmed the formation of nanographenes with bent and helical conformations. Both derivatives exhibited thermally activated delayed fluorescence at room temperature and phosphorescence at low temperatures. Notably, the nanographene with the bent structure displayed an impressive red afterglow lasting over 30seconds, in contrast to the very weak afterglow observed in the helical structure. DFT calculations revealed the existence of an isoenergetic higher triplet state (T-8) and comparatively weak spin-orbit coupling (T-1-S-0), thereby enabling the bent nanographene to exhibit a long-lived component and strong afterglow. Our findings highlight the significance of regioisomeric nanographenes with exceptional optical properties and offer a deeper understanding of the structure-property relationship in nonplanar nanographenes.</p>
10aAfterglow10aCPL10aHelicenes10ananographene10aPhosphorescence10aTADF1 aKumar, Viksit1 aVenugopal, Geethu1 aJadhav, Ashok, Badrinaray1 aDongre, Sangram, D.1 aGonnade, Rajesh1 aKumar, Jatish1 aRuer, Paul, C.1 aHupp, Benjamin1 aSteffen, Andreas1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/regioisomeric-%CF%80-extended-nanographene-long-lived-phosphorescence-afterglow02195nas a2200265   4500008004100000022001400041245011700055210006900172260000800241490000700249520126700256653001201523653000801535653002401543653001801567653001401585100002901599700003401628700002901662700002001691700002601711700003001737700003001767856013201797       2026                        eng d  a1613-681000aOrthogonally Engineered Redox-Active Polyimide-Carbon Nanotube Hybrids for Long-Life Lithium-Ion Battery Cathode0 aOrthogonally Engineered RedoxActive PolyimideCarbon Nanotube Hyb  cJAN0 v223 a<p>
	The diverse structural tunability and engineered electronic properties of organic polymers have sparked significant interest in their use as cathode materials for lithium-ion storage. Recent advances suggest that organic cathodes can serve as promising alternatives to conventional metal oxide counterparts due to their elemental abundance, safety, and high theoretical capacity. However, developing cathode materials that simultaneously exhibit high specific capacity, long cycle life, and excellent rate performance remains a critical challenge. In this study, the synthesis and application of a redox-active polyimide based on orthogonally positioned, active site-rich mellitic trianhydride (MTA) and naphthalene diimide (NDI), integrated with multi-walled carbon nanotubes (MWCNTs), referred to as MTA-NDI@CNT are reported. The pristine MTA-NDI polymer demonstrates a specific capacity of 60 mAh g-1 at a current density of 200 mA g-1 and exhibits remarkable cycling stability over 20 000 cycles. Upon hybridisation with CNT (10 wt.%), the composite (MTA-NDI@CNT) delivers a nearly threefold enhancement in specific capacity, reaching 170 mAh g-1 at 500 mA g-1, along with stable cycling performance over 1300 cycles and 60.5% capacity retention.</p>
10acathode10aCNT10alithium-ion battery10aorthogonality10aPolyimide1 aThanasekar, Chandragopal1 aJavaregowda, Bharathkumar, H.1 aVeer, Sairam, Dnyaneshwa1 aDevasia, George1 aKrishnamurty, Sailaja1 aKrishnamoorthy, Kothandam1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/orthogonally-engineered-redox-active-polyimide-carbon-nanotube-hybrids-long-life-lithium-ion