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The title tetra-nuclear copper complex, [Cu 4 Cl 6 O(C 6 H 9 N 3 O 3 ) 4 ] or [Cu 4 Cl 6 O-(MET) 4 ] [MET is 1-(2-hy-droxy-eth-yl)-2-methyl-5-nitro-1 H -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 via 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 CuCl 3 NO 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 ▸). Acta Cryst . C 71 , 9-16] in PLATON [Spek (2009 ▸). Acta Cryst. D 65 , 148-155].

acta crystallographica. section e, crystallographic communications

Crystal structure of hexa-μ-chlorido-μ4-oxido-tetrakis{[1-(2-hydroxyethyl)-2-methyl-5-nitro-1H-imidazole-κN 3]copper(II)} containing short NO2...NO2 contacts