作者:Tahsin J. Chow、Yan-Ting Pan、Yu-Shan Yeh、Yuh-Sheng Wen、Kew-Yu Chen、Pi-Tai Chou
DOI:10.1016/j.tet.2005.05.023
日期:2005.7
The rates of photoinduced electron transfer (ET) reactions across two oligo-norbornyl spacer groups (S), that is, structure 1 fused by two norbornadiene (NBD) units and structure 2 fused by three NBD units, are examined. Substituted naphthalene acted as an electron donor (D), whilst ethylene-1,2-dicarboxylate as an electron acceptor (A). ET rates were measured by fluorescence quenching experiments
跨两个低聚降冰片烯间隔基(S)(即结构1由两个降冰片二烯(NBD)单元融合)和结构2的光诱导电子传递(ET)反应速率检查由三个NBD单元融合而成的单元。取代的萘充当电子给体(D),而1,2,2-二羧酸乙烯酯充当电子受体(A)。通过荧光猝灭实验对这些D–S–A二聚体测量ET率,并根据Marcus关系将结果与反应自由能相关。发现具有苯基取代基的萘显示出相对较慢的ET速率。苯基取代基的构象柔韧性可能会阻碍D与A之间的电子偶联。另一个显着特征是在非极性溶剂(如环己烷)中观察到异常高的猝灭速率,其结果可能归因于竞争性的能量转移过程。