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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A homobimetallic complex of chromium(0) with a σ-borane component
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A homobimetallic complex of chromium(0) with a σ-borane component

机译:铬(0)与σ-硼烷成分的均双金属配合物

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摘要

The synthesis, characterization, and reactivity of a chromium(0) complex bearing an amine-borane moiety (η~6-C_6H _5CH_2NMe_2·BH_3)Cr(CO) _3 (2) is reported. Photolysis of complex 2 results in the elimination of a CO ligand followed by the formation of an intramolecular σ-borane complex (η~1-(η~6-C_6H_5CH _2NMe_2·BH_2~-H))Cr(CO)_2 (3). This species was characterized in solution by NMR spectroscopy. Reaction of complex 2 with photochemically generated (OC)5Cr(THF) affords a novel homobimetallic σ-borane complex (OC)_3Cr(η~6- C_6H_5CH_2NMe_2·BH _2~-H-Cr(CO)_5) (4), wherein one of the BH moieties is bound to the chromium center in an η~1-fashion. The σ-borane complex 4 was isolated in moderate to good yield (72%). The BH3 fragment in the complexes 3 and 4 are highly dynamic involving exchange of the BH hydrogen bound to the metal with the terminal BH hydrogen atoms. The dynamics has been studied using variable-temperature NMR spectroscopy. Complexes 2 and 4 have been characterized by X-ray crystallography.
机译:报道了带有胺-硼烷部分(η〜6-C_6H _5CH_2NMe_2·BH_3)Cr(CO)_3(2)的铬(0)配合物的合成,表征和反应活性。配合物2的光解导致消除了CO配体,随后形成了分子内σ-硼烷配合物(η〜1-(η〜6-C_6H_5CH _2NMe_2·BH_2〜-H))Cr(CO)_2(3) 。该物种在溶液中通过NMR光谱表征。配合物2与光化学生成的(OC)5Cr(THF)的反应提供了一种新型的同双金属σ-硼烷配合物(OC)_3Cr(η〜6- C_6H_5CH_2NMe_2·BH _2〜-H-Cr(CO)_5)(4), BH部分之一以η〜1-方式键合到铬中心。 σ-硼烷络合物4的分离率中等至良好(72%)。配合物3和4中的BH3片段是高度动态的,涉及结合到金属上的BH氢与末端BH氢原子的交换。使用可变温度NMR光谱研究了动力学。配合物2和4已经通过X射线晶体学表征。

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