Acta Cryst. (2013). E69, m92-m93
[ doi:10.1107/S1600536812051641 ]

rac-Dichlorido[3-ethoxy-3-(1-ethyl-1H-benzimidazol-2-yl)-2,3-dihydro-1H-pyrrolo[1,2-a]benzimidazole]copper(II)

R. T. Stibrany and J. A. Potenza

Abstract: The title complex, [CuCl₂(C₂₁H₂₂N₄O)], contains a bis(benzimidazole) unit with a chiral bridgehead C atom that forms part of a tetrahydropyrrole ring fused to one of the benzimidazoles. The chelate angle is 90.45 (9)° and the dihedral angle between the essentially planar benzimidazole fragments is 26.68 (9)°. The Cu^II coordination geometry lies approximately midway between tetrahedral and square planar. Overall, each chiral molecule contains six fused rings, and a racemic mixture is formed with symmetry-related enantiomers. In the crystal, C-H and C-HCl interactions link molecules into a supramolecular chain along the a-axis direction.

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