An anionic, tetragonal copper(II) superoxide complex.

An anionic, tetragonal copper(II) superoxide complex.
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DOI:
10.1021/ja106244k
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发表时间:
2010-11-17
影响因子:
15
通讯作者:
Tolman WB
Tolman WB
中科院分区:
化学1区
文献类型:
--
作者:
Donoghue PJ;Gupta AK;Boyce DW;Cramer CJ;Tolman WB

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洞察铜氧物种提出的氧化催化的中间体是由一个空间位阻,吡啶二甲酰胺配体支持的Cu(II)-超氧化物配合物的鉴定。基于DFT计算和UV-vis、NMR、EPR和共振拉曼光谱,提出了一种四元末端超氧化物结构。该配合物与[(tmpa)Cu(CH 3CN)]OTf反应后产生反式-1,2-过氧二铜(II)物种,并且与其他已知的Cu(II)-超氧化物配合物不同,在与苯酚的反应中充当碱而不是亲电(H-原子提取)试剂。
Insight into copper-oxygen species proposed as intermediates in oxidation catalysis is provided by the identification of a Cu(II)-superoxide complex supported by a sterically hindered, pyridinedicarboxamide ligand. A tetragonal, end-on superoxide structure is proposed based on DFT calculations and UV-vis, NMR, EPR, and resonance Raman spectroscopy. The complex yields a trans-1,2-peroxodicopper(II) species upon reaction with [(tmpa)Cu(CH3CN)]OTf, and, unlike other known Cu(II)-superoxide complexes, acts as a base rather than an electrophilic (H-atom abstracting) reagent in reactions with phenols.
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