期刊
LIQUID CRYSTALS
卷 42, 期 10, 页码 1351-1369出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2015.1049567
关键词
2-(or 3-) substituted phenyl 4'-(4-alkoxy phenylazo) benzoates; mesophase behaviour; dipole moment; dipolar anisotropy
Eight homologous series of 2- (or 3-) substituted phenyl 4'-(4-alkoxy phenylazo) benzoates (Ina-h) were prepared in which, within each homologous series, the length of the terminal alkoxy group varies between 6, 8, 10 and 12 carbons, while the other substituent, X, is a laterally attached polar group that alternatively changed from CH3, H, F, Br and CN. Compounds prepared were characterised by infrared and H-1-NMR spectroscopy, and their mesophase behaviour investigated by differential scanning calorimetry and identified by polarised light microscopy. The results were discussed in terms of polarity and steric effects. The stability of the mesophase was correlated once with the dipolar anisotropy of the whole molecule and another with the dipolar anisotropy of the substituent, X. A comparative study was made between the investigated compounds and their previously prepared linear 4-substituted isomers, namely 4-substituted phenyl 4'-(4-alkoxy phenylazo) benzoates (Ini-k).
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