3B03 4'-n-アルコキシ-3'-ニトロビフェニル-4-カルボン酸同族体(ANBC-n)のキュービック液晶相のアルコキシ鎖長依存性

概要

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The structures of two cubic (Cub I and II), smectic C (SmC), and a structured liquid (I_1) phases of 4'-alkoxy-3'-nitrobiphenyl-4-carboxylic acids (ANBC-n) have been studied by X-ray diffraction. The samples examined were ANBC-n with n=15, 16, 18, 19, 20, 22, and 26, where n is the number of carbons in the alkoxy chains. The Cub II phase, observed for all seven homologues, is of Ia3d type. For n=22 and 26, another type of cubic phases, Cub I, was observed at the lower temperature side of each Cub II, which was of Im3m type. On the basis of the rod-structure models, the diameter and the length of the constituent rod were estimated for both phases and their dependence on the alkoxy chain length n is discussed.
日本液晶学会の論文
1999-09-28