含S,N杂环戊烯桥头的二芳烯光致变色化合物的合成及性质研究

光致变色材料是目前光功能材料领域中研究的热点之一.在众多的光致变色体系中,二芳烯化合物因其良好的热稳定性和抗疲劳性使其在信息光存储及分子光开关等领域有着广泛的应用前景.     

具有多个光致变色单元的二芳基乙烯分子光密度的增加

3,4-Diaryl-2,5-dihydropyrrole with multiphotochromophore units la was synthesized and its photochromic properties were investigated. It showed that all photochromophore units underwent reversible ring-opening （1a） and ring-closing （1b） photoisomerization reactions in both solution and polymer film with UV/Vis light irradiation, and photochromic properties of la were similar to those of photochromic diarylethene with monophotochromophore 2a. It was found that the optical density of lb was increased linearly with increase of the photochromophore units by comparison with that of 2b in the same condition. It was also found that no significant changes in absorption band and response time between diarylethenes with multiphotochromophores and monophotochromophore were detected in the same condition.