Acta Cryst. (2008). E64, m1053-m1054  [ doi:10.1107/S1600536808022605 ]

Di--chlorido-bis[dichlorido(3,3',5,5'-tetramethyl-4,4'-bipyrazol-1-ium-N^2')copper(II)] dihydrate

M. A. Kurawa, C. J. Adams and A. G. Orpen

Abstract: The structure of the centrosymmetric title compound, [Cu₂Cl₆(C₁₀H₁₅N₄)₂]·2H₂O, consists of a dimeric [{(HMe₄bpz)CuCl₃}₂] unit (HMe₄bpz is 3,3',5,5'-tetramethyl-4,4'-bipyrazol-1-ium) with two solvent water molecules. Each [HMe₄bpz]⁺ cation is bonded to a CuCl₃ unit through a Cu-N dative bond, effectively making square-planar geometry at the Cu atom. Two of these units then undergo a face-to-face dimerization so that the Cu atoms have a Jahn-Teller distorted square-pyramidal geometry with three chlorides and an N atom in the basal plane and one chloride weakly bound in the apical position. Several N-HCl, O-HCl and N-HO hydrogen bonds form a three-dimensional network.

Online 23 July 2008

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