Columnar Mesomorphism of Fluorescent Board-Shaped Quinoxalinophenanthrophenazine Derivatives with Donor–Acceptor Structure
作者:Shuai Chen、Farah S. Raad、Mohamed Ahmida、Bilal R. Kaafarani、S. Holger Eichhorn
DOI:10.1021/ol303375x
日期:2013.2.1
Quinoxalino[2′,3′:9,10]phenanthro[4,5-abc]phenazine (QPP) dyes have been studied as electron acceptor materials, fluorophores, and building blocks for self-organizing organic semiconductors. Condensation of tetraketopyrene with electron-rich diamino-terphenylene and -triphenylene derivatives generates new donor–acceptor QPP derivatives that display columnar mesomorphism over wide ranges of temperature;
Dibenzo[18]crown‐6 derivatives 1 with two lateral tetraalkyloxy o‐terphenyl units were prepared and converted to the corresponding complexes KX⋅1 (X=halide, BF4, PF6, SCN) and NH4PF6⋅1. Complexation was probed by MALDI‐TOF spectrometry and NMR spectroscopy. Downfield shifts of 1H NMR signals for complexes with soft anions Br, I, SCN, and PF6 indicated the presence of tight ion pairs, whereas complexes
decoupled from the MIDA head group. These theoretical findings were supported by IR and Raman spectra as well as by asingle crystal structure analysis of 4‐ethoxyphenyl MIDA boronate. Calculations of the electrostatic potential of the MIDA boronate reveal a special polarity pattern that can support the formation of a two‐dimensional network and is likely to explain the liquidcrystallineself‐assembly. The
Triphenylamine- and triazine-containing hydrogen bonded complexes: liquid crystalline supramolecular semiconductors
作者:Beatriz Feringán、Roberto Termine、Attilio Golemme、José M. Granadino-Roldán、Amparo Navarro、Raquel Giménez、Teresa Sierra
DOI:10.1039/d0tc05186a
日期:——
hexagonal columnarmesophase, up to μ ≈ 5 cm2 V−1 s−1. The columnar liquid crystalline phase was obtained by a proper design of a supramolecular mesogen, and this is unprecedented for triphenylamine liquid crystals. In fact, the supramolecules were formed by hydrogen-bonded 1 : 3 complexes of a star-shaped triazine core and three triphenylamine peripheral units. The resulting hexagonal columnar mesophase
尽管已经广泛地研究了三苯胺衍生物作为空穴传输材料,但是对液晶相中的电荷传输性质的研究却被忽略了。在此,据报道,三苯胺液晶可以在一个六角形柱状相达到非常高的空穴迁移率值,高达μ听,说:5厘米2 V -1小号-1。通过适当设计超分子介晶获得柱状液晶相,这对于三苯胺液晶是前所未有的。实际上,超分子是由氢键合的星形三嗪核和三个三苯胺外围单元的1:3配合物形成的。所得的六方柱状中间相可作为成功的支架,将TPA单元限制在柱的外围。进行具有挑战性的DFT理论研究,以基于这种包含大量原子的超分子体系为基础的模型,以研究络合物的稳定性和几何形状及其电子性质。
Liquid-crystalline TADF materials based on substituted carbazoles and terephthalonitrile
作者:Alfiya F. Suleymanova、Marsel Z. Shafikov、Adrian C. Whitwood、Rafał Czerwieniec、Duncan W. Bruce
DOI:10.1039/d1tc00443c
日期:——
Functionalising 2,5-di(N,N'-carbazolyl)terephthalonitrile or 2,3,5,6-tetra(N,N'-carbazolyl)terephthalonitrile on the carbazole moiety with alkoxy chains, gives a family of materials that show TADF response; two of them are also liquid crystalline.