photolysis. An electron transfer reaction from the borate or the gallate counteranion to the excited triplet state of the benzophenone moiety (BP*3) was demonstrated. This reaction leads to the formation of benzophenone radical anion (6) and the boranyl radical, the latter of which dissociates rapidly to form butyl radical. The electron transfer rate was found to depend on the polarity of the solvent. In neat
的光还原ñ - (p -benzoylbenzyl) - ñ,Ñ,ñ -三Ñ -butylammonium三苯基Ñ -butylborate(1)和
没食子酸酯(2使用纳米和皮秒激光闪光光解)进行了研究。证明了从
硼酸根或
没食子酸根抗衡离子到
二苯甲酮部分(BP * 3)的激发三重态的电子转移反应。该反应导致形成
二苯甲酮自由基阴离子(6)和
硼烷自由基,后者会迅速解离形成丁基自由基。发现电子转移速率取决于溶剂的极性。在纯苯中,获得的三重态的短寿命(300±150 ps)表示分子内过程,并且该化合物以紧密的离子对形式存在。添加1%MeCN可使三线态寿命延长至1.2 ns。建议在该溶剂混合物中形成溶剂分离的离子对。然而,在极性溶剂MeCN中,1和2部分以游离离子形式存在,这取决于它们的解离常数。在该溶剂中显示出扩散控制的分子间电子转移过程。所述p -benzoylbenzyl自由基(BPCH 2 •)