Dichotomy in the Reactivity of Trivalent Phosphorus Compounds Z
<sub>3</sub>
P (Z = Ph,
<i>n</i>
Bu, OR) Observed in the Photoreaction with a Ruthenium Complex
作者:Shinro Yasui、Munekazu Tsujimoto、Kosei Shioji、Atsuyoshi Ohno
DOI:10.1002/cber.19971301122
日期:1997.11
Solutions of tris(2,2′-bipyridyl)ruthenium(II) dichloride (Ru2+) and various types of trivalent phosphorus compounds Z3P (Z = Ph, n-Bu, OR; 1) in methanol have been photolyzed with visible light at 20 °C under an argon atmosphere, resulting in the oxidation of 1 to the corresponding pentavalent oxo compounds Z3PO and ligand exchange of Ru2+ with 1. The former process takes place via single-electron
三(2,2'-联吡啶基)二氯化钌(II)(Ru 2+)和各种类型的三价磷化合物Z 3 P(Z = Ph,n -Bu,OR; 1)在甲醇中的溶液已用在20°C的氩气气氛中产生可见光,导致1被氧化为相应的五价含氧化合物Z 3 PO,Ru 2+与1发生配体交换。前一过程通过单电子转移(SET)1至Ru 2+在光激发态Ru 2 + *下生成自由基阳离子中间体Z 3P. +源自1。后者是1对Ru 2 + *的亲核攻击所致。结果表明,1既可以作为电子供体,也可以作为对Ru 2 + *的亲核试剂。估计两个过程的速率常数。与胺的SET猝灭相比,芳香族和脂肪族三价磷的SET速率对数与氧化电位之间具有极好的线性相关性。另一方面,双参数相关分析表明,配体交换受1中的空间和电子因子调节。