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Influence of the Alkyl Spacer Length on the Phase Transition Behaviour of the λ-Shaped Liquid Crystal

ABSTRACT We reported that a novel λ-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 λ-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 I-7 and I-9 showed the phase sequence of N-SmA-SmCanti-Cr.