Acta Cryst. (2013). E69, m73-m74
[ doi:10.1107/S1600536812051422 ]

Di--chlorido-bis[(2,2'-bipyridine-5,5'-dicarboxylic acid-²N,N')chloridocopper(II)] dimethylformamide tetrasolvate

S. Øien, D. S. Wragg, K. P. Lillerud and M. Tilset

Abstract: In the title compound, [Cu₂Cl₄(C₁₂H₈N₂O₄)₂]·4C₃H₇NO, which contains a chloride-bridged centrosymmetric Cu^II dimer, the Cu^II atom is in a distorted square-pyramidal 4 + 1 coordination geometry defined by the N atoms of the chelating 2,2'-bipyridine ligand, a terminal chloride and two bridging chloride ligands. Of the two independent dimethylformamide molecules, one is hydrogen bonded to a single -COOH group, while one links two adjacent -COOH groups via a strong accepted O-HO and a weak donated C(O)-HO hydrogen bond. Two of these last molecules and the two -COOH groups form a centrosymmetric hydrogen-bonded ring in which the CH=O and the -COOH groups by disorder adopt two alternate orientations in a 0.44:0.56 ratio. These hydrogen bonds link the Cu^II complex molecules and the dimethylformamide solvent molecules into infinite chains along [-111]. Slipped - stacking interactions between two centrosymmetric pyridine rings (centroid-centroid distance = 3.63 Å) contribute to the coherence of the structure along [0-11].

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