moieties and electron-donating BTEC units are linked by hydrogen-bonds and π–π stacking interactions to form the donor–acceptor systems. Under light irradiation, photoactivated electrons can transfer from the donor to the acceptor units in both 1 and 2, giving rise to a long-lived charge-separated state and accompanying an interesting color changing phenomenon. Crystals of 2 allowed to dehydrate at elevated
研究了三个D–A超分子系统的结构与其光响应特性之间的关系。化合物1 [H 2 CPBPY]·[H 2 B
TEC]和化合物2 [HCPBPY] 2 ·[H 2 B
TEC]·5H 2用相同的原料在不同的pH值下制备O,并通过单晶X射线衍射,粉末X射线衍射,UV-vis,IR和ESR光谱进行表征。缺电子的CPBPY部分和给电子的B
TEC单元通过氢键和π-π堆积相互作用连接在一起,形成供体-受体系统。在光照射下,光活化电子可以在1和2中从供体转移到受体单元,从而产生长寿命的电荷分离状态,并伴随着有趣的变色现象。2的晶体在高温下脱
水,经过单晶至单晶转化,生成3 [HCPBPY] 2 ·[H2 B
TEC],伴随着结构安排的急剧变化。对于光致变色特性,化合物1显示出比2和3更快的光响应速率。对于荧光性质,化合物1和2既表现出光致发光发射中心在400nm,而3所表现出光致发光发射在520nm,显示出120