Acta Cryst. (2005). E61, m1904-m1906  [ doi:10.1107/S160053680502739X ]

A copper(II)-oxalate compound resulting from the fixation of carbon dioxide: -oxalato-bis[bis(1-benzyl-1H-pyrazole)(trifluoromethanesulfonato)copper(II)]

R. T. Stibrany, H. J. Schugar and J. A. Potenza

Abstract: Reductive coupling of adventitious CO₂ by Cu^I has afforded the title compound, -oxalato-1²O¹,O²:2²O^1',O^2'-bis[bis(1-benzyl-1H-pyrazole-N²)(trifluoromethanesulfonato-O)copper(II)], [Cu₂(CF₃O₃S)₂(C₂O₄)(C₁₀H₁₀N₂)₄], which contains centrosymmetric molecules in which the Cu^II ions, bridged by a planar oxalate ligand, exhibit a distorted square-pyramidal N₂(pyrazole)O₂(oxalato)O(trifluoromethanesulfonate) coordination geometry, with the trifluoromethanesulfonate ligand coordinated axially. The molecule exhibits five intramolecular C-HO,F hydrogen bonds per asymmetric unit, which help to stabilize the molecule and to orient the benzyl and trifluoromethanesulfonate groups. Intermolecular C-HO hydrogen bonds link the molecules to form two-dimensional layers.

Online 7 September 2005

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