Acta Cryst. (2009). E65, m498-m499  [ doi:10.1107/S1600536809012641 ]

{6,6'-Diethoxy-2,2'-[4,5-dimethyl-o-phenylenebis(nitrilomethylidyne)]diphenolato}nickel(II) dihydrate

H. Kargar, R. Kia, A. Jamshidvand and H.-K. Fun

Abstract: In the title complex, [Ni(C₂₆H₂₆N₂O₄)]·2H₂O, the Ni^II ion, lying on a twofold crystallographic rotation axis, has a square-planar geometry, being coordinated by the N₂O₂ unit of the tetradentate Schiff base ligand. The asymmetric unit of the title compound comprises one-half of the complex molecule and one of the water molecules of crystallization. The water H atoms form bifurcated O-H(O,O) hydrogen bonds with the O atoms of the phenolato and ethoxy groups with R₁²(5) and R₁²(6) ring motifs. The dihedral angle between the central benzene ring and the two outer benzene rings are 4.07 (11) and 3.99 (12)°. The dihedral angle between the two O-Ni-N coordination planes is only 0.77 (11)°. In the crystal structure, the molecules are linked together into extended chains along the c axis by intermolecular O-HO and C-HO interactions. An interesting feature of the crystal structure is a short intermolecular C C [3.355 (3) Å] contact, which is shorter than the sum of the van der Waals radii. The crystal structure may be further stabilized by intermolecular - interactions [centroid-centroid distances in the range 3.5758 (13)-3.6337 (13) Å].

Online 8 April 2009

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