期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 15, 期 2, 页码 280-288出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b406716a
关键词
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A homologous series of novel lambda-shaped mesogenic compounds in which three mesogenic groups are connected to 3, 4-dihydroxybenzoic acid has been prepared and their physical properties investigated by means of optical microscopy, differential scanning calorimetry and X-ray diffraction measurements. The lambda-shaped compounds studied showed unusual smectic phases. 4-Cyanobiphenyl-4'-yl 3,4-bis{6-[4-(5-octylpyrimidin-2-yl)phenyloxy]hexyloxy} benzoate was found to realize an incommensurate SmA (SmAinc) phase. A uniform planarly aligned sample of 2-(4-octylphenyl)pyrimidin-5-yl 3,4-bis{6-[4-(5-octylpyrimidin-2-yl)phenyloxy]hexyloxy} benzoate showed a Schlieren-like texture in the smectic phase. We discuss structural effects of the lambda-shaped compounds on molecular organization in liquid-crystal line phases.
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