Acta Cryst. (2009). E65, m627-m628  [ doi:10.1107/S1600536809016602 ]

Diaquabis[4-(dimethylamino)benzoato]-²O,O';O-(isonicotinamide-N¹)cobalt(II)

T. Hökelek, H. Dal, B. Tercan, Ö. Aybirdi and H. Necefoglu

Abstract: The title Co^II complex, [Co(C₉H₁₀NO₂)₂(C₆H₆N₂O)(H₂O)₂], contains two 4-dimethylaminobenzoate (DMAB) anions, one isonicotinamide (INA) ligand and two coordinated water molecules. One of the DMAB anions acts as a bidentate ligand, while the other is monodentate. The four O atoms in the equatorial plane around the Co atom form a highly distorted square-planar arrangement, while the distorted octahedral coordination geometry is completed by the N atom of the INA ligand and the O atom of the second water molecule in the axial positions. An intramolecular O-HO hydrogen bond between the monodentate-coordinated carboxyl group and a coordinated water molecule results in a six-membered ring with an envelope conformation. The dihedral angles between the carboxyl groups and the adjacent benzene rings are 4.29 (10)° for the monodentate ligand and 2.31 (13)° for the bidentate ligand, while the two benzene rings are oriented at a dihedral angle of 65.02 (5)°. The dihedral angles between the pyridine and benzene rings are 11.21 (5)° for the monodentate ligand and 74.60 (5)° for the bidentate ligand. In the crystal structure, intermolecular O-HO, O-HN and N-HO hydrogen bonds link the molecules into a supramolecular structure.

Online 14 May 2009

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