A novel family of azobenzene-based photochromic amorphous molecular materials has been created. They were found to readily form amorphous glasses with well-defined glass-transition temperatures and to exhibit photochromism as amorphous films as well as in solution. It was found that their quantum yields of transâcis photoisomerization were smaller as amorphous films than in solution and that the backward cisâtrans thermal isomerization reactions as amorphous films were either accelerated or retarded relative to those in solution, depending upon their molecular structures. In addition, the rate acceleration for the cisâtrans thermal isomerization as amorphous films relative to solution was found to be more prominent as the irradiation time for generating the cis-isomer became shorter.
创建了一系列新型
偶氮苯基光致变色无定形分子材料。人们发现它们很容易形成具有明确
玻璃化转变温度的非晶
玻璃,并且在非晶薄膜和溶液中都表现出光致变色性。研究发现,非晶态薄膜的反式-顺式光异构化量子产率小于溶液中的量子产率,并且非晶态薄膜的逆式顺式-反式热异构化反应相对于溶液中的反应加速或延迟,具体取决于它们的分子结构。此外,随着生成顺式异构体的照射时间变短,非晶态薄膜相对于溶液的顺式-反式热异构化的速率加速更加显着。