Long-Range Electron Transfer across Molecule−Nanocrystalline Semiconductor Interfaces Using Tripodal Sensitizers
作者:Elena Galoppini、Wenzhuo Guo、Wei Zhang、Paul G. Hoertz、Ping Qu、Gerald J. Meyer
DOI:10.1021/ja025840n
日期:2002.7.1
are exponential for 1-4 in solution and are nonexponential when 1-4 are bound to ZrO(2) or TiO(2). Efficient and rapid (k(cs) > 10(8) s(-)(1)) excited-state electron injection is observed for 1-4/TiO(2). The recombination of the injected electron with the oxidized Ru(III) center is well described by a second-order kinetic model with rate constants that are independent of the sensitizer. The sensitizers
四种三足感光剂,Ru(bpy)(2)(Ad-tripod-phen)(2+) (1), Ru(bpy)(2)(Ad-tripod-bpy)(2+) (2), Ru( bpy)(2)(C-tripod-phen)(2+) (3) 和 Ru(bpy)(2)(C-tripod-bpy)(2+) (4)(其中 bpy 是 2,2' -联吡啶,phen 是 1,10-菲咯啉,Ad-tripod-bpy (phen) 和 C-tripod-bpy (phen) 是基于 1,3,5,7-四苯基金刚烷的三脚架形 bpy (phen) 配体和四苯基甲烷,分别),已被合成和表征。三足敏化剂由一端连接到 Ru(II)-聚吡啶复合物的刚性杆臂和另一端与金属氧化物纳米颗粒表面结合的三个 COOR 基团组成。已在室温下研究了溶剂化和表面结合 1-4 的激发态和氧化还原特性。吸收光谱、发射光谱、当 1-4 与纳米晶(锐钛矿)TiO(2)