Author： Ossowska‐Chruściel M. D. Roszkowski P. Rudzki A. Chruściel J.
Publisher： Taylor & Francis Ltd
ISSN： 0267-8292
Source： Liquid Crystals, Vol.32, Iss.7, 2005-07, pp. : 877-887
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Abstract
New liquid crystalline chloro‐substituted thioesters containing two and three benzene rings have been synthesized. 4‐Chlorophenyl 4‐ n ‐alkoxythiobenzoates and 4‐chlorophenyl 4‐ n ‐alkoxybenzoyloxy‐4′‐thiobenzoates are referred to as n O.SCl and n O.OSCl, respectively, where n varies from 4 to 16 for n O.SCl, from 4 to 10 for n O.OSCl and denotes the number of carbon atoms in the alkyl chain. Their mesomorphic properties were investigated by means of polarizing optical microscopy, differential scanning calorimetry, transmittance light intensity and X‐ray diffraction measurements. The n O.SCl homologous series possesses smectic A (SmA) and nematic (N) phases for n = 4, 5, 6 while higher homologues have only an enantiotropic SmA phase. Those from the n O.OSCl homologous series have enantiotropic N and SmA phases and higher transition temperatures. The range of the N phase decreases, and of the SmA increases, with the elongation of the alkoxy chain in the n O.OSCl homologous series. The effect on mesomorphic behaviour of terminal alkoxy chain lengthening and replacement by chlorine on the other side of the molecule is discussed.
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