Design and investigation of a Ru(II) N-heterocyclic complex which undergoes proton coupled electron transfer
Design and investigation of a Ru(II) N-heterocyclic complex which undergoes proton coupled electron transfer
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DOI：
10.1016/s0020-1693(01)00667-3
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发表时间：
2002-01-30
影响因子：
2.8
通讯作者：
Slattery, SJ
中科院分区：
文献类型：
--
作者：
Ayers, T;Caylor, N;Slattery, SJ
为研究质子耦合电子转移，设计了一种含单电离质子的新型三叉戟配体。该配体由6位的2,2′-联吡啶与苯并咪唑（bpy-bzimH）衍生合成，并用于制备化合物[Ru(bpy-bzimH(2)](PF6)(2)。循环伏安法表征了非质子（0.1 M TBAH-CH2Cl2）和质子（1:1乙腈-水缓冲溶液）溶剂条件下的氧化还原行为，后者用于表征Ru（III/II）对ph的依赖性。在1.39 ~ 2.58和5.92 ~ 7.97两个不同的pH区域，氧化还原电位表现为一个质子/一个电子的转移，而在2.58 ~ 5.92之间表现为一个两质子/一个电子的转移。(C) 2002 Elsevier Science B.V.版权所有
A novel tridentating ligand containing a single ionizable proton was designed for studying proton coupled electron transfer. The ligand was synthesized by derivatizing 2,2'-bipyridine at the 6-position with benzimidazole (bpy-bzimH), and it was used to prepare the compound [Ru(bpy-bzimH(2)](PF6)(2). Cyclic voltammetry was used to characterize the redox behavior in an aprotic (0.1 M TBAH-CH2Cl2) and protic (1:1 acetonitrile-water buffered solutions) solvent conditions where the latter was employed to characterize the pH-dependence of the Ru(III/II) couple. The redox potential as a function of pH was plotted and reveals a one-proton/one-electron transfer in two separate pH regions (1.39-2.58, and 5.92-7.97), while a two-proton/one-electron process was exhibited between 2.58 and 5.92. (C) 2002 Elsevier Science B.V. All rights reserved.