Sulfur Bridging Interactions of Cis-Planar Ni<sup>II</sup>−S<sub>2</sub>N<sub>2</sub> Coordination Units with Nickel(II), Copper(I,II), Zinc(II), and Mercury(II): A Library of Bridging Modes, Including Ni<sup>II</sup>(μ<sub>2</sub>-SR)<sub>2</sub>M<sup>I,II</sup> Rhombs
作者:P. Venkateswara Rao、Sumit Bhaduri、Jianfeng Jiang、R. H. Holm
DOI:10.1021/ic040055s
日期:2004.9.1
and NiII, CuI,II, ZnII, and HgII reactants were investigated by synthesis and X-ray crystal structures of some 24 complexes. This work was stimulated by recent crystallographic structures of the A-cluster of carbon monoxide dehydrogenase/acetylcoenzyme A synthase. This bridged biological assembly has the minimal formulation [Fe4S4]-(micro2-SCys)-[M((micro2-SCys)2Gly)Ni] with M = NiII, CuI, and ZnII
通过合成和约24种配合物的X射线晶体结构研究了三种顺式NiII-S2N2配合物与NiII,CuI,II,ZnII和HgII反应物之间的硫桥联反应。一氧化碳脱氢酶/乙酰辅酶A合酶的A簇的最新晶体学结构刺激了这项工作。这种桥接的生物组装体具有最小的[Fe4S4]-(micro2-SCys)-[M((micro2-SCys)2Gly)Ni]构型,在铁的远端和近端分别具有M = NiII,CuI和ZnII -硫簇。通过配合物[NiII(LH-S2N2)] 2-和[NiII(LR-S2N2)]与5-5-5螯合环的反应来寻找由远端镍位点表示支持的桥。反应产物将桥Ni-(micro2-S)1,2-M包含在各种分子结构中,一些具有桥原子以前未知的连通性。最常遇到的桥单元是涉及给定配合物的两个硫原子的非平面菱形Ni(2-S)2M。M = NiII的那些在生物学上是相关的,因为在近端的催化金属是镍。制备了复合物[Ni(L-655)]