Author： Takase A. Nonaka K. Koga T. Sakagami S.
Publisher： Taylor & Francis Ltd
ISSN： 0267-8292
Source： Liquid Crystals, Vol.29, Iss.4, 2002-04, pp. : 605-611
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Abstract
New homologous series of N-[4-(4-n-alkoxybenzoyloxy)-2-hydroxybenzylidene]methylanilines [nAHmM(n=1-8/10;m=2:ortho,m=3:meta,m=4:para)] were synthesized. They exhibited a nematic phase except for 1AH3M. The temperature dependence of their Raman spectra was observed in the spectral range of 900-1700 cm-1. In one group of nAHmM compounds, the Raman band at about 1360 cm-1 abruptly decreased in intensity and wavenumber when the crystalline solid-liquid crystal phase transition was approached. In another group, the corresponding band increased through the phase transition. The bands have been assigned to the coupling mode between the in-plane CCH deformational vibration and the ring-N stretching vibration. Such a behaviour can be explained by the molecular conformation with different twist angles of the aniline ring in relation to the Schiff 's base plane of the molecule. Some nAHmMs exhibited photochromism.
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