From smectic to columnar phase of polypedal liquid crystals based on tetrathiafulvalene/1,3-dithiol-2-thione and cholesterol |
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Authors: | Ruibin HouKe-li Zhong Zhegang HuangLong Yi Jin Bingzhu Yin |
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Institution: | a Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules, Yanbian University, Ministry of Education, Yanji, Jilin 133002, PR Chinab Center for Supramolecular Nano-Assembly and Department of Chemistry, Seoul National University, 599 Kwanak-ro, Seoul 151-747, South Korea |
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Abstract: | Bipedal 1,3-dithiole-2-thiones attached two cholesteryl through a ω-thioalkanoyloxy spacer of varying length were synthesized. The bipedals were easily transformed to the appropriate tetrapedal tetrathiafulvalene derivatives by self-coupling reaction in net triethyl phosphite. All the synthesized compounds exhibit mesogenic phases in a wide temperature region, no crystallization but vitrifying to form glassy mesogens during cooling from the isotropic melt. The liquid crystals with shorter spacer (n=2-6) exhibited only a smectic A phase and those with the longest spacer (n=7) exhibited only a hexagonal columnar. In these series, the molecular packing depended on the length of spacers. |
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Keywords: | Polypedal liquid crystals Tetrathiafulvalene Cholesterol Glassy mesogen Smectic phase Hexagonal columnar phase |
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