Acta Cryst. (2009). E65, m651-m652  [ doi:10.1107/S1600536809017620 ]

Diaquabis[4-(dimethylamino)benzoato](isonicotinamide)zinc(II)

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

Abstract: The molecule of the title Zn^II complex, [Zn(C₉H₁₀NO₂)₂(C₆H₆N₂O)(H₂O)₂], contains two 4-(dimethylamino)benzoate (DMAB) ligands, one isonicotinamide (INA) ligand and two water molecules; one of the DMAB ions acts as a bidentate ligand while the other and INA are monodentate ligands. The four O atoms in the equatorial plane around the Zn atom form a distorted square-planar arrangement, while the distorted octahedral coordination is completed by the N atom of the INA ligand and the O atom of the water molecule in the axial positions. Intramolecular C-HO hydrogen bonding results in the formation of a six-membered ring adopting an envelope conformation. The dihedral angle between the carboxyl groups and the adjacent benzene rings are 4.87 (16) and 2.2 (2)°, while the two benzene rings are oriented at a dihedral angle of 65.13 (8)°. The dihedral angle between the benzene and pyridine rings are 11.47 (7) and 74.83 (8)°, respectively. In the crystal structure, intermolecular O-HO, O-HN and N-HO hydrogen bonds link the molecules into a supramolecular structure. - contacts between the pyridine and benzene rings and between the benzene rings [centroid-centroid distances = 3.695 (1) and 3.841 (1) Å, respectively] further stabilize the structure. Weak intermolecular C-H interactions are also present.

Online 14 May 2009

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