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

Di-[mu]-chlorido-bis[(2,2'-bipyridine-5,5'-dicarboxylic acid-[kappa]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 CuII dimer, the CuII 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-H...O and a weak donated C(O)-H...O 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 CuII complex molecules and the dimethylformamide solvent molecules into infinite chains along [-111]. Slipped [pi]-[pi] 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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