抄録
Some of homologous series of N-(2-hydroxy-4-methoxybenzylidene)-4-alkylanilines(HMBA) in cryslal state undergo the color change on irradiation with UV light. Some of HMBA are pale yellow when freshly prepared and deepened to pale-orange on light irradiation. The life time of colored HMBA(6) was longer (114.6 min) than the other HMBAs. It may be ascribed to the high order molecular packing in HMBA(6) cryslal. Some of HMBAs exhibit the nematic liquid cryslal phase. However, the photochromism was not observed in the nematic phase. The IR spectra show that the central group of HMBA takes the trans-keto amine form in the photochromic colored state.
