Acta Cryst. (2009). E65, m1130-m1131  [ doi:10.1107/S1600536809033200 ]

Tetraaquabis(isonicotinamide-N¹)cobalt(II) bis(4-formylbenzoate) dihydrate

T. Hökelek, F. Yilmaz, B. Tercan, M. Sertçelik and H. Necefoglu

Abstract: The asymmetric unit of the crystal structure of the title complex, [Co(C₆H₆N₂O)₂(H₂O)₄](C₈H₅O₃)₂·2H₂O, contains one-half of the complex cation with the Co^II ion located on an inversion center, a 4-formylbenzoate (FB) counter-anion and an uncoordinated water molecule. The four O atoms in the equatorial plane around the Co^II ion form a slightly distorted square-planar arrangement with an average Co-O bond length of 2.086 Å; the slightly distorted octahedral coordination is completed by the two N atoms of the isonicotinamide (INA) ligands at a slightly longer distance [2.1603 (14) Å] in the axial positions. The dihedral angle between the carboxylate group and the attached benzene ring is 5.93 (13)°, while the pyridine and benzene rings are oriented at a dihedral angle of 3.09 (6)°. In the crystal structure, O-HO, N-HO and C-HO hydrogen bonds link the molecules into a three-dimensional network. - Contacts between the benzene and pyridine rings [centroid-centroid distance = 3.758 (1) Å] may further stabilize the crystal structure.

Online 26 August 2009

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