01787nas 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-molecules01215nas 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-300987nas 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-3-001930nas 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-chirality