Active-Site Models for the Nickel–Iron Hydrogenases: Effects of Ligands on Reactivity and Catalytic Properties
作者:Maria E. Carroll、Bryan E. Barton、Danielle L. Gray、Amanda E. Mack、Thomas B. Rauchfuss
DOI:10.1021/ic2012759
日期:2011.10.3
nickel as well as the dithiolate bridge, 1,3-propanedithiolate (pdt) vs 1,2-ethanedithiolate (edt). A new synthetic route to these Ni–Fe dithiolates is described, involving reaction of Ni(SR)2(diphosphine) with FeI2(CO)4 followed by in situ reduction with cobaltocene. Evidence is presented that this route proceeds via a metastable μ-iodo derivative. Attempted isolation of such species led to the crystallization
描述了[HNiFe(SR) 2 (二膦)(CO) 3 ] +类型的新衍生物,其特征在于Ni(二膦)基团通过两个桥接硫醇盐配体连接到Fe(CO) 3基团。先前的工作描述了 [HNiFe(pdt)(dppe)(CO) 3 ] + ([ 1 H] + ) 及其作为还原质子催化剂的活性 ( J. Am. Chem. Soc. 2010 , 132, 14877)。本文中描述的工作重点是对连接在镍上的二膦以及二硫醇桥、1,3-丙二硫醇 (pdt) 与 1,2-乙二硫醇 (edt) 的 NiFe 模型复合物性质的影响。描述了这些 Ni-Fe 二硫醇盐的新合成路线,包括 Ni(SR) 2(二膦)与 FeI 2 (CO) 4 的反应,然后用二茂钴原位还原。有证据表明该路线通过亚稳态 μ-碘衍生物进行。尝试分离此类物质导致 NiFe(Me 2 pdt)(dppe)I 2结晶,其特征是四面体 Fe(II) 和方形平面