Concentration-Dependent Isotope Effects in Electron Transfer-Mediated Reactions Photocyanation of Biphenyl and Dimethylbiphenyls
作者:Roel Gronheid、Jacob Baggerman、Gerrit Lodder
DOI:10.1021/jp027757s
日期:2003.10.1
magnitude of the hydrogen-deuterium isotope effect (IE) in the photosensitized cyanation of biphenyl is found to depend on the concentration of biphenyl and on that of cyanide, as well as on the ionic strength of the medium. These concentration dependences are shown to originate from intermolecular electron exchange between biphenyl and its radical cation, in competition with addition of cyanide. Similar
发现在联苯的光敏氰化中氢-氘同位素效应 (IE) 的大小取决于联苯的浓度和氰化物的浓度,以及介质的离子强度。这些浓度依赖性显示出源于联苯与其自由基阳离子之间的分子间电子交换,与氰化物的添加竞争。在甲基氘代时对三个对称取代的二甲基联苯进行了类似的观察。IE 的总体大小由最初形成的离子对内的反电子转移步骤的 IE 以及电子交换平衡的 IE 确定。