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Compound (Me2-cAAC:)2Co0 (2; Me2-cAAC:=cyclic (alkyl) amino carbene; :C(CH2)(CMe2)2N-2,6-iPr2C6H3) was synthesized by the reduction of the precursor (Me2-cAAC:)2CoICl (1) with KC8 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 Me2-cAAC: ligands. Bond lengths from X-ray diffraction are 1.871(2) and 1.877(2) Å 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 cAACCo 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.
Journal | Data powered by TypesetChemistry A European Journal |
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Publisher | Data powered by TypesetWiley Online Library |
Open Access | No |