Acta Cryst. (2007). E63, m514-m516  [ doi:10.1107/S1600536807001493 ]

Hexakis--chlorido-dichloridobis[(3,5-dimethylpyrazol-1-yl)acetic acid-²N,N']tetracopper(II): an unexpected neutral bis-pyrazolyl ligand in a tetracopper(II) complex

A. Pevec, B. Kozlevcar, P. Gamez and J. Reedijk

Abstract: A new centrosymmetric tetranuclear complex, [Cu₄(-Cl)₆Cl₂(C₁₂H₁₆N₄O₂)₂], was obtained in varied yields by reaction of bis(3,5-dimethylpyrazol-1-yl)acetic acid (Hbdmpza) with CuCl₂·2H₂O in a highly concentrated acetonitrile solution. Two different types of coordination environment for the Cu atoms characterize the title compound, namely square-pyramidal CuCl₂N₂Cl and distorted square-planar CuCl₄ donor sets. The tetranuclear molecule is located on a centre of inversion in the crystal structure and the molecules are connected via very strong bis-carboxylate hydrogen bonds, resulting in a polymeric chain.

Online 19 January 2007

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