Kinetic study of the photo-induced electron transfer reaction between ruthenium(ii) complexes of 2,2′-bipyridine derivatives and methyl viologen. Effects of bulky substituents introduced onto 2,2′-bipyridine
作者:Taisuke Hamada、Sei-ichi Tanaka、Hiroaki Koga、Yumi Sakai、Shigeyoshi Sakaki
DOI:10.1039/b207048k
日期:2003.2.11
Ruthenium(II) complexes of 2,2′-bipyridine derivatives, [Ru(Rbpy)3]2+ (Rbpy = 4,4′-di(alkylaminocarbonyl)-2,2′-bipyridine; alkyl = propyl, hexyl or adamantyl), have been newly synthesized and their photo-induced electron transfer (ET) reaction with methyl viologen (MV2+) has been investigated. The rate constant of the ET reaction decreases in the order alkyl = propyl > hexyl > adamantyl, which is opposite
2,2'-联吡啶衍生物,[Ru(Rbpy)3 ] 2+ (Rbpy = 4,4'-二(烷基氨基羰基)-2,2'-联吡啶的钌(II)配合物;烷基 = 丙基, 己基 或金刚烷基),已被新合成并被光诱导 电子转移 (ET)与 甲基已研究了紫精(MV 2+)。ET反应的速率常数按顺序降低烷基 = 丙基 > 己基 >金刚烷基,这与引入到其上的烷基氨基羰基取代基的大小增加顺序相反 2,2'-联吡啶。校正扩散速率后,在Marcus的基础上分析了激基复合物中的ET反应[* Ru(Rbpy)3 2 + ⋯MV 2+ ]→[Ru(Rbpy)3 3 + ⋯MV˙ + ]。 ' 理论。电子联轴器矩阵元素(H rp)的降序顺序为丙基(2.28×10 -3 eV)>己基(1.86×10 -3 eV)>金刚烷基(1.37×10 -3 eV),而重组能(λ)几乎不依赖于烷基Rbpy的;λ = 0.772 eV,0.767