Electrochemical and theoretical investigations of the reduction of [Fe2(CO)5L{µ-SCH2XCH2S}] complexes related to [FeFe] hydrogenase
作者:Jean-François Capon、Salah Ezzaher、Frédéric Gloaguen、François Y. Pétillon、Philippe Schollhammer、Jean Talarmin、Thomas J. Davin、John E. McGrady、Kenneth W. Muir
DOI:10.1039/b709273c
日期:——
The complexes [Fe2(CO)6μ-SCH2N(R)CH2S}] (R = CH2CH2OCH3, 1a; R = iPr, 1b) and [Fe2(CO)6(μ-pdt)] 2 (pdt = S(CH2)3S) are structural analogues of the [2Fe]H subsite of [FeFe]H2ases. Electrochemical investigation of 1 and 2 in MeCN–[NBu4][PF6] under Ar and under CO has demonstrated that the reduction can be resolved into two one-electron transfer steps by using fast scan cyclic voltammetry. At slow scan
配合物的[Fe 2(CO)6 μ-SCH 2 N(R)CH 2 S}](R = CH 2 CH 2 OCH 3,图1A ; R =我PR,1B)和[铁2(CO)6(μ-pdt)] 2(pdt = S(CH 2)3 S)是[FeFe] H 2的[2Fe] H亚位的结构类似物。MeCN– [NBu 4 ] [PF 6中的1和2的电化学研究]在Ar和CO下进行的实验表明,该还原可分解为两个电子转移 使用步骤 快速扫描循环伏安法。在慢扫描速率下,由于阴离子的快速歧化,还原1趋于两电子过程,而在存在CO的情况下,两电子还原2明显受到青睐。配体在2由N-杂环卡宾导致阴离子不稳定。因此,在MeCN–,thf-或CH 2 Cl 2 – [NBu 4 ] [PF 6 ]中,Fe 2(CO)5 L NHC(μ-pdt)] 3的电化学还原(L NHC = 1,3-双(甲基)-咪唑-2-亚胺,3a ; 1,3-双(2