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首页> 外文期刊>Chemistry: A European journal >Stabilization of a Two-Coordinate Mononuclear Cobalt(0) Compound
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Stabilization of a Two-Coordinate Mononuclear Cobalt(0) Compound

机译：二坐标单核钴（0）化合物的稳定化。

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摘要

Compound (Me_2-cAAC:)_2Co~0 (2; Me_2-cAAC:=cyclic (alkyl) amino carbene;:C(CH_2)(CMe_2)_2N-2,6-iPr_2C_6H_3) was synthesized by the reduction of the precursor (Me_2-cAAC:)_2Co~ICl (1) with KC_8 in THF. The cyclic voltammogram of 1 exhibited one-electron reduction, which suggests that synthesis of a bent 2-metallaallene (2) from 1 should be possible. Compound 2 contains one cobalt atom in the formal oxidation state zero, which is stabilized by two Me_2-cAAC: ligands. Bond lengths from X-ray diffraction are 1.871(2) and 1.877(2) ? with a C-Co-C bond angle of 170.12(8)°. The EPR spectrum of 2 exhibited a broad resonance attributed to the unique quasi-linear structure, which favors near degeneracy and gives rise to very rapid relaxation conditions. The cAAC-Co bond in 2 can be considered as a typical Dewar–Chatt–Duncanson type of bonding, which in turn retains 2.5 electron pairs on the Co atom as nonbonding electrons.
机译：化合物（Me_2-cAAC：）_ 2Co〜0（2; Me_2-cAAC：=环状（烷基）氨基卡宾;：C（CH_2）（CMe_2）_2N-2,6-iPr_2C_6H_3）的还原反应Me_2-cAAC：）_ 2Co〜ICl（1）与THF中的KC_8。 1的循环伏安图显示单电子还原，这表明从1合成弯曲的2-metallaallene（2）应该是可能的。化合物2包含一个处于形式氧化态零的钴原子，该钴原子被两个Me_2-cAAC：配体稳定。 X射线衍射的键长为1.871（2）和1.877（2）？ C-Co-C键角为170.12（8）°。 2的EPR光谱表现出宽泛的共振，这归因于独特的准线性结构，该结构有利于简并，并产生非常快速的弛豫条件。在2中的cAAC-Co键可以被认为是典型的杜瓦-查特-邓肯森键，它在Co原子上保留了2.5个电子对作为非键电子。

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