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-assembly01754nas a2200193   4500008004100000245012000041210006900161260000800230300001400238490000700252520106000259100002101319700001501340700002201355700001801377700001701395700001701412856013101429       2019                        eng d00aSquaraine-linked metalloporphyrin two-dimensional polymer photocatalyst for hydrogen and oxygen evolution reactions0 aSquarainelinked metalloporphyrin twodimensional polymer photocat  cJAN  a1627-16300 v553 aEfficient water splitting photocatalysts are an energetically demanding and cost-effective method for generating renewable energy. Significant research has been reported to advance this approach. However, the use of organic photocatalysts and the presence of residual catalysts trapped in the porous frameworks present major concerns about the efficiency of this strategy. Herein, we report the photocatalytic evolution of H2 and O2 by a multi-hydroxyl group-decorated metalloporphyrin-based two-dimensional catalyst developed via metal catalyst-free synthetic route. Though metalloporphyrins have long been used for catalytic functions, a heterogeneous photocatalyst delivering both H2 and O2 has not yet been realized. This polymer catalyst design enables the photocatalytic diatomic O2 release, a bottleneck in water splitting, in a facile way. Photocatalytic release of H2 as well as O2 occurs with long-term durability of 20 cycles in 300 days with negligible decrease in efficiency, thus demonstrating the excellent performance of this new catalyst.1 aRanjeesh, K., C.1 aGeorge, L.1 aWakchaure, V., C.1 aGoudappagouda1 aDevi, R., N.1 aBabu, S., S.  uhttps://library.ncl.res.in/content/squaraine-linked-metalloporphyrin-two-dimensional-polymer-photocatalyst-hydrogen-and-oxygen02111nas 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-state