Reactivity Studies on Fe<sup>III</sup>−(O<sub>2</sub><sup>2-</sup>)−Cu<sup>II</sup> Compounds: Influence of the Ligand Architecture and Copper Ligand Denticity
作者:Eduardo E. Chufán、Biplab Mondal、Thirumanavelan Gandhi、Eunsuk Kim、Nick D. Rubie、Pierre Moënne-Loccoz、Kenneth D. Karlin
DOI:10.1021/ic700363k
日期:2007.8.1
enzymes which effect reductive O-O cleavage of dioxygen to water. In this report, the chemistry of four heme-peroxo-copper [FeIII-(O22-)-CuII]+ complexes (1-4), varying in their ligand architecture, copper-ligand denticity, or both and thus their structures and physical properties are compared in their reactivity toward CO, PPh3, acids, cobaltocene, and phenols. In 1 and 2, the copper(II) ligand is N4-tetradentate
血红素-Cu / O2加合物对阐明血红素-Cu酶中发生的基本金属-O2化学性质具有重要意义,该化学作用可实现将双氧还原为水的OO裂解。在本报告中,研究了四种血红素-过氧-铜[FeIII-(O22-)-CuII] +配合物(1-4)的化学性质,它们的配体结构和/或铜-配体密度或两者均不同,因此其结构和物理性质也有所不同比较了它们对CO,PPh3,酸,钴茂和酚的反应性。在图1和图2中,铜(II)的配体是N4-四齿的,并且过氧单元与铁(III)侧接,并与铜(II)端接。相反,3和4包含一个N3三齿铜(II)配体,并且过氧单元与两个金属离子侧面键合。CO从2-4“取代”过氧配体形成还原的CO-FeII和CO-CuI物种。PPh3与3和4反应,从铜上取代过氧化物配体,形成(卟啉)FeIII-超氧化物加CuI-PPh3。配合物2不与PPh3反应,令人惊讶的是,1不与PPh3或CO反应,对这些试剂表现出