Photoinduced Electron Transfer across Oligo-<i>p</i>-phenylene Bridges. Distance and Conformational Effects in Ru(II)−Rh(III) Dyads
作者:Maria Teresa Indelli、Claudio Chiorboli、Lucia Flamigni、Luisa De Cola、Franco Scandola
DOI:10.1021/ic700430u
日期:2007.7.1
series of rodlike ruthenium(II)-rhodium(III) polypyridine dyads based on modular oligo-p-phenylene bridges, of the general formula [(Me2phen)2Ru-bpy-(ph)n-bpy-Rh(Me2bpy)]5+ (Me2phen=4,7-dimethyl-1,10-phenanthroline; bpy=2,2'-bipyridine; ph=1,4-phenylene; n=1-3), have been synthesized and their photophysical properties investigated. The dyad [(Me2bpy)2Ru-bpy-(ph)3'-bpy-Rh(Me2bpy)]5+ with the central
基于通式[(Me2phen)2Ru-bpy-(ph)n-bpy-Rh(Me2bpy)] 5的一系列基于模块化低聚对亚苯基桥的棒状钌(II)-铑(III)聚吡啶二联体+(Me2phen = 4,7-二甲基-1,10-菲咯啉; bpy = 2,2'-联吡啶; ph = 1,4-亚苯基; n = 1-3),并对其光物理性质进行了研究。还研究了带有中心亚苯基带有两个己基链的二元[(Me2bpy)2Ru-bpy-(ph)3'-bpy-Rh(Me2bpy)] 5+。对于该系列中最长(n = 3)的垫片,金属到金属的距离达到24A。对于室温CH3CN溶液中的所有二元组,观察到Ru基发色单元的典型金属到配体电荷转移发光的猝灭,这表明发生了从激发的Ru部分到Rh基单元的分子内光诱导电子的有效转移。通过纳秒和皮秒级的时间分辨发射和吸收光谱法确定了电子转移过程的速率常数。观察到实验传输速率对桥长度的指数依赖性,