Homeotropic alignment through charge-transfer-induced columnar mesophase formation in an unsymmetrically substituted triphenylene derivative

Juanjuan Li, Zhiqun He, Huan Zhao, Hemant Gopee, Xiangfei Kong, Min Xu, Xinxin An, Xiping Jing, Andrew N. Cammidge

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Abstract

An unsymmetrically substituted triphenylene, with two adjacent chloroethoxyethyl lateral flexible chains, was synthesized and characterized. Although this compound showed no mesomorphic behavior, it formed a donor acceptor charge-transfer complex with 2,4,7-trinitrofluorenone (TNF). The resulting I: I complex has been investigated using UV-vis and IR spectroscopy, optical microscopy, thermal analysis, and X-ray diffraction. A columnar mesophase with hexagonal symmetry was found. More interestingly, this charge-transfer complex can be easily aligned on a glass surface in a homeotropic orientation, which is stable at room temperature (RT) and over a wide temperature range.
Original languageEnglish
Pages (from-to)1993–2003
Number of pages11
JournalPure and Applied Chemistry
Volume82
Issue number11
DOIs
Publication statusPublished - 2010

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