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

Date Published: May 01, 2009

Publisher: International Union of Crystallography

Author(s): Hadi Kargar, Reza Kia, Arezoo Jamshidvand, Hoong-Kun Fun.


In the title complex, [Ni(C26H26N2O4)]·2H2O, the NiII 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—H⋯O and C—H⋯O 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 π–π inter­actions [centroid–centroid distances in the range 3.5758 (13)–3.6337 (13) Å].

Partial Text

For bond-length data, see Allen et al. (1987 ▶). For related structures see, for example: Clark et al. (1968 ▶, 1969 ▶, 1970 ▶). For the applications and bioactivity of Schiff base complexes see, for example: Elmali et al. (2000 ▶); Blower (1998 ▶); Granovski et al. (1993 ▶); Li & Chang, (1991 ▶); Shahrokhian et al. (2000 ▶). For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶).




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