Crystal structure of hexa-μ-chlorido-μ-oxido-tetra-kis-{[1-(2-hy-droxy-eth-yl)-2-methyl-5-nitro-1-imidazole-κ ]copper(II)} containing short NO⋯NO contacts.

The title tetra-nuclear copper complex, [CuClO(CHNO)] or [CuClO-(MET)] [MET is 1-(2-hy-droxy-eth-yl)-2-methyl-5-nitro-1-imidazole or metronidazole], contains a tetra-hedral arrangement of copper(II) ions. Each copper atom is also linked to the other three copper atoms in the tetra-hedron bridging chloride ions. A fifth coordination position on each metal atom is occupied by a nitro-gen atom of the monodentate MET ligand. The result is a distorted CuClNO trigonal-bipyramidal coordination polyhedron with the axial positions occupied by oxygen and nitro-gen atoms. The extended structure displays O-H⋯O hydrogen bonding, as well as unusual short O⋯N inter-actions [2.775 (4) Å] between the nitro groups of adjacent clusters that are oriented perpendicular to each other. The scattering contribution of disordered water and methanol solvent mol-ecules was removed using the SQUEEZE procedure [Spek (2015 ▸). . C, 9-16] in [Spek (2009 ▸). D, 148-155].