Acta Cryst. (2006). E62, m881-m883  [ doi:10.1107/S1600536806010750 ]

Copper(II) chlorofumarate trihydrate

H. Billetter, I. Pantenburg and U. Ruschewitz

Abstract: Blue crystals of the title compound, poly[[[diaquacopper(II)]-₃-chlorofumarato] monohydrate], {[Cu(OOC-CH=CCl-COO)(H₂O)₂]·H₂O}_n, crystallized unexpectedly from an aqueous solution containing acetylenedicarboxylic acid and CuCl₂. Each copper cation is coordinated by five O atoms - three from three fumarate anions and two from two water molecules - in the form of a distorted square pyramid. All atoms of the asymmetric unit, except a carboxylate oxygen and the coordinated water molecule, lie on a mirror plane. These units are connected by the bifunctional anions to form ribbons along [001]. These ribbons are held together by hydrogen bonds, which also involve the third water molecule.

Online 29 March 2006

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