Solution equilibria and structural characterisation of the transition metal complexes of glycyl-l-cysteine disulfide
作者:Csaba G. Ágoston、Katalin Várnagy、Attila Bényei、Daniele Sanna、Giovanni Micera、Imre Sóvágó
DOI:10.1016/s0277-5387(00)00469-1
日期:2000.7
structure of the complexes formed in the reaction of copper(II), nickel(II), zinc(II), cobalt(II) and cadmium(II) with (GlyCys)2 containing disulfide bond were determined by potentiometric, UV–Vis, NMR and EPR spectroscopic methods. The complex [Ni(GlyCys)2·H2O] was prepared in the solid state and its structure determined by single crystal X-ray diffraction method. Disulfide sulfur atoms of (GlyCys)2 were
用电位法测定了铜(II),镍(II),锌(II),钴(II)和镉(II)与含二硫键(GlyCys)2的反应形成的配合物的化学计量,稳定性常数和结构。,UV-Vis,NMR和EPR光谱方法。以固态制备了配合物[Ni(GlyCys)2 ·H 2 O],并通过单晶X射线衍射法确定了其结构。(GlyCys)2的二硫键硫原子在溶液或固态研究的任何系统中都不是金属结合位点。发现铜(II)能够诱导去质子化和肽酰胺氮供体原子的配位。这导致[CuL],[Cu 2 H-2 L]和[CuH -1 L] -作为溶液中的主要物质。在镍(II),钴(II),锌(II)和镉(II)的情况下,络合物[ML]占主导地位,并且该物种的出色稳定性是由(NH 2,CO)协调的五元螯合物溶液。[Ni(GlyCys)2 ·H 2 O]的晶体结构揭示了聚合物结构中镍(II)的八面体几何形状。