Influence of the Alkyl Spacer Length on the Phase Transition Behaviour of the λ-Shaped Liquid Crystal
作者:Akihisa Yamaguchi、Atsushi Yoshizawa、Isa Nishiyama、Jun Yamamoto、Hiroshi Yokoyama
DOI:10.1080/15421400590956225
日期:2005.6
We reported that a novel A-shaped liquid-crystalline molecule I-6 in which a cyanobiphenyl and two phenylpyrimidine groups are connected to 3, 4-dihydroxybenzoic acid exhibits an incommensurate SmA phase. In the present study, we have prepared the homologous series of the A-shaped molecules I-n (n = 4, 5, 7, 8, 9, 12) and investigated effect of the spacer length on the phase transition behaviour. Compounds I-4, I-8 and I-12 with an even member of atoms in spacer showed the phase sequences of N-SmA-Cr or SmA-Cr. On the other hand, the odd members 1-7 and 1-9 showed the phase sequence of N-SmA-SmCanti-Cr.