Acta Cryst. (2009). E65, m1328-m1329  [ doi:10.1107/S1600536809040409 ]

Tetrakis[-4-(methylamino)benzoato-²O:O']bis[(N,N-diethylnicotinamide-N¹)zinc(II)] dihydrate

T. Hökelek, F. Yilmaz, B. Tercan, Ö. Aybirdi and H. Necefoglu

Abstract: The title molecule, [Zn₂(C₈H₈NO₂)₄(C₁₀H₁₄N₂O)₂]·2H₂O, is a centrosymmetric binuclear complex, with two Zn^II ions [ZnZn' = 2.9301 (4) Å] bridged by four methylaminobenzoate (MAB) ligands. The four nearest O atoms around each Zn^II ion form a distorted square-planar arrangement with the distorted square-pyramidal coordination completed by the pyridine N atom of the N,N-diethylnicotinamide (DENA) ligand. Each Zn^II ion is displaced by 0.3519 (2) Å from the plane of the four O atoms, with an average Zn-O distance of 2.030 Å. The dihedral angles between carboxylate groups and adjacent benzene rings are 10.57 (10) and 16.63 (12)°, while the benzene rings are oriented at a dihedral angle of 81.84 (5)°. The pyridine ring is oriented at dihedral angles of 40.49 (6) and 51.25 (6)° with respect to the benzene rings. In the crystal structure, intermolecular O-HO and N-HO hydrogen bonds link the molecules into a three-dimensional network. The - contact between the inversion-related pyridine rings [centroid-centroid distance = 3.633 (1) Å] may further stabilize the crystal structure.

Online 10 October 2009

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