Photoinduced Electron Transfer in Covalently Linked 1,8-Naphthalimide/Viologen Systems
作者:Thao P. Le、Joy E. Rogers、Lisa A. Kelly
DOI:10.1021/jp000855y
日期:2000.7.1
A series of polymethylene-linked 1,8-naphthalimide/viologen diads has been synthesized. The number of intervening methylenes was varied from 2 to 6. For comparison, a series of N-alkylpyridiniumyl-1,8-naphthalimide “parent” compounds was prepared and photophysically characterized. Relative to the parent compounds, the electronically excited singlet state of the 1,8-naphthalimide was found to be quenched
已经合成了一系列聚亚甲基连接的 1,8-萘酰亚胺/紫精二联体。中间亚甲基的数量从 2 到 6 不等。为了比较,制备了一系列 N-烷基吡啶鎓基-1,8-萘酰亚胺“母体”化合物并对其进行光物理表征。相对于母体化合物,1,8-萘酰亚胺的电子激发单线态被发现被共价连接的紫精淬灭。根据稳态荧光光谱的 Stern-Volmer 分析,以及吡啶鎓取代的 1,8-萘酰亚胺的单线态寿命,计算出分子内猝灭的速率常数范围为 1.5 × 1010 s-1 (2中间亚甲基)至 8.3 × 107 s-1(6 个中间亚甲基)在缓冲水溶液中。为了比较,评估了 N-烷基吡啶基-1,8-萘酰亚胺的激发单重态与甲基紫精的分子间反应性。在 0.5 M 磷酸盐缓冲液 (pH 7.0) 中,发现双分子速率常数...