Acta Cryst. (2004). E60, m9-m11  [ doi:10.1107/S1600536803027119 ]

Bis(-1,2,4-triazole-²N¹:N²)bis[diaqua(oxalato-²O,O')copper(II)]

O. Castillo, U. García-Couceiro, A. Luque, J. P. García-Terán and P. Román

Abstract: The crystal structure of the title compound, [Cu₂(C₂O₄)₂(C₂H₃N₃)₂(H₂O)₄], consists of dimeric neutral entities with D₂ (222) point symmetry. The two Cu^II atoms (site symmetry 2) are linked by two symmetry-related N¹,N²-bidentate 1,2,4-triazole bridges (one of the N atoms has site symmetry 2). The distorted octahedral coordination around each Cu atom is completed by two O donor atoms from a terminal bidentate oxalate ligand in the equatorial plane, and two trans-coordinated water molecules occupying the apical positions with longer metal-oxygen distances. The complete solid-state structure can be described as a three-dimensional supramolecular framework, stabilized by extensive hydrogen-bonding interactions involving the water molecules, the non-coordinated oxalate O atoms and the protonated N atom of the triazole ligands. The thermal degradation of the title compound was carried out in air between 298 and 873  K.

Online 6 December 2003

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