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The crystal structure of bis-[μ-(1,3-dimesityl-1 H -imidazol-3-ium-2-yl)methano-lato-κ 2  O : O ]bis-[di-chlorido-copper(II)], [Cu 2 Cl 4 (C 22 H 26 N 2 O) 2 ], is reported. The complex is assumed to have formed via the insertion of formaldehyde into the copper-carbon bond in an N-heterocyclic carbene complex of copper(I) chloride. The structure of the binuclear mol-ecule possesses a crystallographic-ally centrosymmetric Cu 2 O 2 central core with the O atoms bridging between the Cu II atoms and thus Z ' = 0.5. The copper centres are further ligated by two chloride ligands, resulting in the Cu II atoms residing in a distorted square-planar environment. The Cu-O bond lengths are shorter than those previously reported in structures with the same central Cu 2 O 2 motif. The complex displays C-H⋯Cl inter-actions involving the H atoms of the heterocycle backbone and the chloride ligands of a neighbouring mol-ecule.

acta crystallographica. section e, crystallographic communications

Crystal structure of the [(1,3-dimesityl-1<i>H</i>-imidazol-3-ium-2-yl)methanolato]copper(II) chloride dimer: insertion of formaldehyde into a copper–carbene bond

Crystal structure of the [(1,3-dimesityl-1H-imidazol-3-ium-2-yl)methanolato]copper(II) chloride dimer: insertion of formaldehyde into a copper–carbene bond