study of liquid crystalline N -[4-(4- n -alkoxybenzoyloxy)-2-hydroxybenzylidene]methylanilines

摘要: 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 their Raman spectra was observed in the spectral range 900–1700 cm-1. In one group nAHmM compounds, band at about 1360 cm-1 abruptly decreased intensity and wavenumber when crystalline solid-liquid crystal transition approached. another group, corresponding increased through transition. bands have been assigned to coupling mode between in-plane CCH deformational vibration ring-N stretching vibration. Such behaviour can be explained by molecular conformation with different twist angles aniline ring relation Schiff's base plane molecule. Some nAHmMs photochromism.