Paper
New mesogenic compounds with unconventional molecular structures 1,2-Phenylene and 2,3-naphthylene bis[4-(4-alkoxyphenyliminomethyl)benzoates] and related compounds
Published Jan 1, 1993 · H. Matsuzaki, Y. Matsunaga
Liquid Crystals
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Abstract
Abstract DSC and X-ray studies on a series of 1,2-phenylene bis[4-(4-alkoxyphenyliminomethyl)benzoates] are presented. The phases were shown to be classical nematic and/or smectic by their continuous miscibilities with reference mesophases. The layer spacings in the smectic A phase measured as a function of the alkyl chain length revealed that the mean tilt angle of the linear three-ring part of the molecule to the layer normal is about 37° and that the molecular core is V-shaped with an angle of about 70° between the two out-stretched benzoate legs. This molecular model accounts for the effects of a methyl group introduced into the 3- or 4-position of the 1,2-phenylene moiety on the mesomorphic properties. Both the nematic and smectic A properties are markedly promoted by replacement of the 1,2-phenylene group by the 2,3-naphthylene group. The phases exhibited by the less-elongated series of 2,3-naphthylene bis(4-alkoxybenzoates) are also nematic and/or smectic A, but are now monotropic. The formation of...
New mesogenic compounds with unconventional molecular structures, 1,2-phenylene bis[4-(4-alkoxyphenyliminomethyl)benzoates] and related compounds, exhibit classical nematic and/or smectic properties, with the 2,3-naphthylene
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