Bis(μ2-benzoato-κ2O,O′)bis­(benzoato-κO)bis(ethanol-κO)bis­(μ3-hydroxido)hexa­kis­(μ-pyrazol­ato-κ2N,N′)hexa­copper(II) ethanol disolvate

Abstract

Trinuclear copper–pyrazolate entities are present in various Cu-based enzymes and nanojar supra­molecular arrangements. The reaction of copper(II) chloride with pyrazole (pzH) and sodium benzoate (benzNa) assisted by microwave radiation afforded a neutral centrosymmetric hexa­nuclear copper(II) complex, [Cu6(C7H5O2)4(OH)2(C3H3N2)6(C2H5OH)2]·2C2H5OH. Half a mol­ecule is present in the asymmetric unit that comprises a [Cu3(μ3-OH)(pz)3]2+ core with the copper(II) atoms arranged in an irregular triangle. The three copper(II) atoms are bridged by an O atom of the central hydroxyl group and by three bridging pyrazolate ligands on each of the sides. The carboxyl­ate groups show a chelating mode to one and a bridging syn,syn mode to the other two CuII atoms. The coordination environment of one CuII atom is square-planar while it is distorted square-pyramidal for the other two. Two ethanol mol­ecules are present in the asymmetric unit, one binding to one of the CuII atoms, one as a solvent mol­ecule. In the crystal, stabilization arises from inter­molecular O—H⋯O hydrogen-bonding inter­actions.