Dichlorido{2-[2-(piperidin-1-yl)ethyliminomethyl]phenolato}zinc(II) monohydrate

In the title mononuclear zinc(II) complex, [ZnCl2(C14H20N2O)]·H2O, the ZnII atom is four-coordinated by the phenolate O and imine N atoms of the Schiff base ligand and by two Cl atoms in a tetrahedral geometry. In the crystal structure, O—H⋯Cl, O—H⋯O and N—H⋯O hydrogen bonds involving the water molecules bridge adjacent complexes into a ladder-like structure running along the c axis.

In the title mononuclear zinc(II) complex, [ZnCl 2 (C 14 H 20 -N 2 O)]ÁH 2 O, the Zn II atom is four-coordinated by the phenolate O and imine N atoms of the Schiff base ligand and by two Cl atoms in a tetrahedral geometry. In the crystal structure, O-HÁ Á ÁCl, O-HÁ Á ÁO and N-HÁ Á ÁO hydrogen bonds involving the water molecules bridge adjacent complexes into a ladder-like structure running along the c axis.
The title compound consists of a mononuclear Schiff base zinc(II) complex molecule and a water of hydration (Fig. 1).
The Zn II atom in the complex is four-coordinate in a tetrahedral geometry with one phenolate O and one imine N atoms of the Schiff base ligand, and with two Cl atoms. Bond lengths and angles (Table 1) about the Zn II centre are comparable with the values observed in other Schiff base zinc(II) complexes (Wang, 2007;Ali et al., 2008;Li, 2007;Tatar et al., 2002). The crystal structure is stabilized by intermolecular O-H···Cl, O-H···O and N-H···O hydrogen bonds (Table 2 and Fig. 2).

Experimental
A mixture of salicylaldehyde (0.1 mmol, 12.2 mg), 2-piperidin-1-ylethylamine (0.1 mmol, 12.8 mg) and ZnCl 2 (0.1 mmol, 13.6 mg) in methanol was stirred for 30 min at room temperature to give a yellow solution. After keeping the solution in air for 12 d, yellow block-shaped crystals were formed.

Refinement
Atoms H2A, H2B and H2C were located from a difference Fourier map and refined isotropically, with O-H, N-H, and H···H distances restrained to 0.85 (1), 0.90 (1), and 1.37 (2) Å, respectively. The remaining H atoms were placed in calculated positions and constrained to ride on their parent atoms, with C-H = 0.93 or 0.97 Å and U iso (H) = 1.2U eq (C). Fig. 1. The molecular structure of the title compound, showing 30% probability displacement ellipsoids.

Special details
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.