双核锇自由基配合物[Os2Cp*2(CO)4] •+的分离与结构表征
首发时间:2017-05-11
摘要:为了探索金属与金属之间的化学键本质,对双核锇的配合物进行了单电子氧化,分离得到了一例双核锇的自由基阳离子配合物[Os2Cp*2(CO)4] •+,并进行了结构表征。通过对其进行电子顺磁共振光谱表征和理论计算,发现自旋密度主要位于配体上。单晶结构解析表明,双核锇的羰基化合物经过单电子后,金属间的键长几乎没有发生变化。同时在其与三苯甲基碳自由基阳离子的反应过程中,采取sp3杂化的C-H键被活化。经推测,可能是通过electrochemical-chemical(EC)机理进行的。
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Isolation and structural characterization of a dinuclar osmium radical complex [Os2Cp*2(CO)4] •+
Abstract:To explore the nature of metal-metal bonds, the carbonyl complex Os2Cp*2(CO)4 was carried out one-electron oxidation, and a radical cation of dinuclear osmium complex was isolated and structurally characterized. The EPR spectrum and theoretical calculation indicate that the spin density mainly resides on ligands. The X-ray structure shows the change of metal-metal bond length is negligible upon one-electron oxidation. sp3 C–H bond activation was observed during the reaction of parent molecule with the trityl cation, which possibly occurs via an oxidative electrochemical-chemical (EC) mechanism.
Keywords: ligands dinuclar metal diosmium radical cation C–H bond activation
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No.4732404222691493****
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