Bis{4-chloro-2-[(2-hydroxyethyl)iminomethyl]phenolato}nickel(II) monohydrate

The title mononuclear nickel(II) complex, [Ni(C9H9ClNO2)2]·H2O, was obtained by the reaction of 5-chlorosalicylaldehyde, 2-aminoethanol and nickel nitrate in methanol. The Ni atom is six-coordinated by two phenolate O, two imine N and two hydroxy O atoms from two crystallographically different Schiff base ligands, forming an octahedral geometry. In the crystal, molecules are linked through intermolecular O—H⋯O and O—H⋯Cl hydrogen bonds.

The title mononuclear nickel(II) complex, [Ni(C 9 H 9 Cl-NO 2 ) 2 ]ÁH 2 O, was obtained by the reaction of 5-chlorosalicylaldehyde, 2-aminoethanol and nickel nitrate in methanol. The Ni atom is six-coordinated by two phenolate O, two imine N and two hydroxy O atoms from two crystallographically different Schiff base ligands, forming an octahedral geometry. In the crystal, molecules are linked through intermolecular O-HÁ Á ÁO and O-HÁ Á ÁCl hydrogen bonds.
N, and two hydroxy O atoms from two Schiff base ligands, forming an octahedral geometry. The trans angles at the Ni atom are in the range 172.5 (1)-174.1 (1)°; the other angles are close to 90°, ranging from 80.1 (1) to 94.9 (1)°, indicating a slightly distorted octahedral coordination. The Ni-O and Ni-N bond lengths (Table 1) are typical and are comparable with those observed in other similar nickel(II) complexes (Arıcı et al., 2005;Liu et al., 2006;Li & Wang, 2007;Ali et al., 2006).
In the crystal structure of the compound, molecules are linked through intermolecular O-H···O and O-H···Cl hydrogen bonds (Table 2), to form a three-dimensional network (Fig. 2).
Experimental 5-Chlorosalicylaldehyde (1.0 mmol, 0.157 g), 2-aminoethanol (1.0 mmol, 0.061 g), and nickel nitrate hexahydrate (0.5 mmol, 0.146 g) were dissolved in MeOH (30 ml). The mixture was stirred at room temperature for 10 min to give a clear green solution. After keeping the solution in air for a week, green block-shaped crystals were formed at the bottom of the vessel.

Refinement
The water and hydroxy H atoms were located from a difference Fourier map and refined isotropically, with O-H and H···H distances restrained to 0.85 (1) and 1.37 (2) Å, respectively. Their isotropic displacement parameters were fixed at 0.08 Å 2 ).