Synthesis and X-ray Absorption Spectroscopy Structural Studies of Cu(I) Complexes of HistidylHistidine Peptides: The Predominance of Linear 2-Coordinate Geometry
作者:Richard A. Himes、Ga Young Park、Amanda N. Barry、Ninian J. Blackburn、Kenneth D. Karlin
DOI:10.1021/ja0708013
日期:2007.5.1
β-peptide. Chelation of copper(I) by these ligands affords linear, two-coordinate complexes as studied structurally by X-ray absorption spectroscopy. The complexes are robust toward oxidation, showing limited to no reactivity with O2, and they bind CO weakly. Reaction with a third ligand (N-methylimidazole) affords complexes with a markedly different structure (distorted T-shaped) and reactivity, binding
修饰的 His-His 二肽已与铜 (I) 盐反应,以模拟由某些氧激活铜蛋白以及淀粉样蛋白 β-肽中的连续 His 残基结合的活性位点 Cu 离子。这些配体对铜 (I) 的螯合提供了线性的双配位配合物,如通过 X 射线吸收光谱进行结构研究。这些复合物对氧化非常有效,与 O2 几乎没有反应性,并且它们与 CO 结合较弱。与第三个配体(N-甲基咪唑)的反应提供具有明显不同结构(扭曲的 T 形)和反应性的复合物,结合 CO 并在暴露于双氧时迅速氧化。