PBa01 N-[4-(4-n-alkoxybenzoyloxy)-2-hydroxy-benzylidene]-iodoanilines液晶同族体のラマン散乱による研究

抄録

N-[4-(4-n-alkoxybenzoyloxy)-2-hydroxy-benzylidene]-iodoanilines[nAHmI(n; n=1-8, m; m=2:-ortho, m=3: -meta, m=4: -para)] were newly synthesized. para-I substituted nAH4Is exhibited a nematic phase. meta-I substituted (4-8)AH3I and ortho-I substituted (4, 8)AH2I exhibited a monotropic nematic phase. The temperature dependence of Raman spectra of nAHmI was observed and some of the Raman bands changed in intensity and frequency through the phasetransitions. Their changes can be explained by the change of the molecular conformation. Of particular interest is that the behavior of the band around 990 cm^<-1> ascribed to the CH out-of-plane vibration of the aniline ring is explained by the change in the twist angle of the aniline ring to the salicylaldimino part of the molecule. Some of nAHmI showed a photochromic property in the solid state. It was found that the band aroud 990 cm^<-1> is a reliable indication of the photochromic form's identity.