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

• Published in: Acta crystallographica. Section E, Structure reports online Vol. 69; no. 2; pp. m73 - m74
• Main Authors: Øien, Sigurd, Wragg, David Stephen, Lillerud, Karl Petter, Tilset, Mats
• Format: Journal Article
• Language: English
• Published: International Union of Crystallography 01-02-2013
• ISSN: 1600-5368; 1600-5368
• DOI: 10.1107/S1600536812051422

In the title compound, [Cu
2
Cl
4
(C
12
H
8
N
2
O
4
)
2
]·4C
3
H
7
NO, 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—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 Cu
II
complex molecules and the dimethylformamide solvent molecules into infinite chains along [-111]. Slipped π–π stacking interactions between two centrosymmetric pyridine rings (centroid–centroid distance = 3.63 Å) contribute to the coherence of the structure along [0-11].