Electron-Transfer Reactions of Ruthenium Trisbipyridyl-Viologen Donor-Acceptor Molecules: Comparison of the Distance Dependence of Electron Transfer-Rates in the Normal and Marcus Inverted Regions
作者:Edward H. Yonemoto、Geoffrey B. Saupe、Russell H. Schmehl、Stefan M. Hubig、Richard L. Riley、Brent L. Iverson、Thomas E. Mallouk
DOI:10.1021/ja00090a026
日期:1994.6
rates of photoinduced forward and thermal back electron transfer (ET) in a series of donor-acceptor molecules (2,2[prime]-bipyridine)[sub 2]Ru(4-CH[sub 3]-2,2[prime]-bipyridine-4[prime]) (CH[sub 2])[sub n](4,4[prime]-bipyridinium-CH[sub 3])[sup 4+] (n = 1-5,7,8) were studied by flash photolysis/transient absorbance techniques. The rate of intramolecular forward ET (MLCT quenching) in acetonitrile varies
一系列供体-受体分子(2,2[prime]-联吡啶)[sub 2]Ru(4-CH[sub 3]-2,2[prime) 中光致正向和热反向电子转移 (ET) 的速率]-bipyridine-4[prime]) (CH[sub 2])[sub n](4,4[prime]-bipyridinium-CH[sub 3])[sup 4+] (n = 1-5,7, 8) 通过闪光光解/瞬态吸收技术研究。乙腈中分子内正向 ET(MLCT 猝灭)的速率随间隔链中碳原子数呈指数变化,最高为 n = 5,并且对于 n = 5、7、8 大致恒定,与主要[开放引号]一致短链通过键[闭引号]电子转移途径,长链通过溶剂[闭引号]途径[开引号]。β-环糊精分子对间隔链的包封减缓了前向 ET 的速率,n=7、8、与[开放引号]通过债券[开放引号] ET 途径一致。发生在 Marcus 倒置区域的反向 ET 速率也随 n 呈指数变化,但比正向