Dichlorido-2κ2 Cl-{μ-6,6′-dimethoxy-2,2′-[propane-1,3-diylbis(nitrilomethylidyne)]diphenolato-1κ4 O 1,N,N′,O 1′:2κ2 O 1,O 1′}copper(II)zinc(II)

In the title compound, [CuZnCl2(C19H20N2O4)], the CuII ion exhibits a slightly distorted square-planar coordination geometry defined by two N atoms and two O atoms of the 6,6′-dimethoxy-2,2′-[propane-1,3-diylbis(nitrilomethylidyne)]diphenolate Schiff base ligand. The ZnII ion is also four-coordinated by the two phenolate O atoms of the Schiff base ligand and by two cis-coordinated chloride anions.

In the title compound, [CuZnCl 2 (C 19 H 20 N 2 O 4 )], the Cu II ion exhibits a slightly distorted square-planar coordination geometry defined by two N atoms and two O atoms of the 6,6 0 -dimethoxy-2,2 0 -[propane-1,3-diylbis(nitrilomethylidyne)]diphenolate Schiff base ligand. The Zn II ion is also four-coordinated by the two phenolate O atoms of the Schiff base ligand and by two cis-coordinated chloride anions.

Comment
Heterometallic complexes have been intensively focused on owing to their unique physical and chemical properties (Ward et al., 2007;Ni et al., 2005 andNi et al. 2007). In addition, these compounds exist at the active sites of many metalloenzymes and play important roles in biological systems (Karlin, 1993). Whereas, it is necessary to further widen the system of heterometallic compounds. Herein, a new heterometallic dinuclear (Cu II Zn II ) compound has been obtained. Its structure is depicted in the Figure 1.
Compound I is a dinuclear neutral complex with a slightly distorted planar configuration. The Cu II atom is coordinated by two nitrogen atoms and two oxygen atoms from L 2ligand forming a square-planar geometry. The coordination environment of each Zn II atom is in a distorted tetrahedral geometry composed of two oxygen atoms from L 2ligand and two chlorine atoms occupying the the other two positions. The dihedral angle of two aromatic rings is 26.90 (4)°. The Cu II atom and Zn II atom are connected via two bridging phenoxo oxygen atoms of L 2ligand, The bond lengths of Cu-O, Cu-N, Zn-O and Zn-Cl are normal (Gheorghe et al. 2006 andKorupoju et al., 2000).

Experimental
The H 2 L ligand and complex CuL was synthesized according to the previous literature (Gheorghe et al. 2006). the synthesis method of the compound I was obtained by allowing a mixure of CuL (0.088 g, 0.2 mmol) and ZnCl 2 .2H 2 O(0.044 g, 0.2 mmol) to be stirred in the methanol solution at room temperature, cooled down to room temperature and then filtered.
Suitable yellow needle-shaped crystals were obtained via slow evaporation of the filtrate at room temperature.

Refinement
All H-atoms bound to carbon were refined using a riding model with distance C-H = 0.93 Å, U iso = 1.2U eq (C) for aromatic atoms and C-H = 0.96 Å, U iso = 1.5U eq (C) for methyl atoms. and the 'isor' order is used to restrain the C10 atom with wARP as 0.005 (Ng, 2005 Fig. 1. A view of (I) with the unique atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level, all hydrogen atoms are ommited for clarity.