Research Article: Diaqua­bis(N,N-diethyl­nicotinamide-κN1)bis­(4-methyl­benzoato-κO)cobalt(II)

Date Published: May 01, 2010

Publisher: International Union of Crystallography

Author(s): Hacali Necefoğlu, Efdal Çimen, Barış Tercan, Emel Ermiş, Tuncer Hökelek.


In the centrosymmetric mononuclear title complex, [Co(C8H7O2)2(C10H14N2O)2(H2O)2], the CoII ion is located on an inversion center. The asymmetric unit contains one 4-methyl­benzoate (PMB) anion, one N,N-diethyl­nicotinamide (DENA) ligand and one coordinated water mol­ecule. The four O atoms in the equatorial plane around the CoII ion form a slightly distorted square-planar arrangement, while the slightly distorted octa­hedral coordination is completed by the two pyridine N atoms of the DENA ligands in the axial positions. The dihedral angle between the carboxyl­ate group and the attached benzene ring is 3.73 (14)°, while the pyridine and benzene rings are oriented at a dihedral angle of 77.28 (6)°. In the crystal structure, inter­molecular O—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a two-dimensional network parallel to (001). The structure is further stabilized by π–π contacts between the pyridine rings [centroid–centroid distance = 3.544 (1) Å] and weak C—H⋯π inter­actions involving the benzene ring.

Partial Text

For niacin, see: Krishnamachari (1974 ▶), and for the nicotinic acid derivative N,N-diethyl­nicotinamide, see: Bigoli et al. (1972 ▶). For related structures, see: Hökelek et al. (1996 ▶, 2009a ▶,b ▶,c ▶); Hökelek & Necefoğlu (1998 ▶); Necefoğlu et al. (2010 ▶).




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