[N,N′-Bis(2,6-dichlorobenzylidene)propane-1,3-diamine-κ2 N,N′]dibromidozinc

In the title compound, [ZnBr2(C17H14Cl4N2)], the ZnII ion is bonded to two bromide ions and two N atoms of the diimine ligand and displays a moderately distorted tetrahedral coordination geometry. The Schiff base ligand acts as a chelating ligand and coordinates to the ZnII atom via two N atoms.

In the title compound, [ZnBr 2 (C 17 H 14 Cl 4 N 2 )], the Zn II ion is bonded to two bromide ions and two N atoms of the diimine ligand and displays a moderately distorted tetrahedral coordination geometry. The Schiff base ligand acts as a chelating ligand and coordinates to the Zn II atom via two N atoms.

Experimental
Crystal data [ZnBr 2 (C 17 H 14 (Khalaj et al., 2008(Khalaj et al., , 2009Salehzadeh et al.,2011;Khalaji et al.,2010Khalaji et al., , 2011Khalaji et al., , 2012. The molecular structure of 1 with the atom-numbering scheme is presented in Fig. 1, and the bond lengths and angles are generally normal (Allen et al., 1987). The zinc(II) ion is coordinated by the bidentate Schiff-base ligand and two Br ions. Although a tetrahedral geometry might be expected for a four coordinated zinc(II) centre, the geometry around the zinc(II) ion is distorted by the bite angle N1-Zn1-N2 [90.24 (6)°] of the chelating ligand. On the contrary the Br1-Zn11-Br2 angle has opened up to 120.866 (11)°. The N-Zn-Br angles are also distorted from the tetrahedral values.

Experimental
To a stirring solution of the (2,6-Cl-ba) 2 en ligand (1 mmol, in 5 ml of chloroform) was added ZnBr 2 (1 mmol) in 10 ml of methanol and the mixture was stirred for 10 min in air at room temperature and was then left at 273 K for several days without disturbance yielding suitable crystals that subsequently were filtered off and washed with Et 2 O.

Refinement
All H atoms were positioned geometrically and treated as riding on their parent atoms. The displacement coefficients U iso (H) were set to 1.2U eq (C).  The molecular structure of 1. Displacement ellipsoids are drawn at the 50% probability level.

Special details
Experimental. Absorption correction: CrysAlisPro (Agilent Technologies, 2011) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. Refinement. The refinement was carried out against all reflections. The conventional R-factor is always based on F. The goodness of fit as well as the weighted R-factor are based on F and F 2 for refinement carried out on F and F 2 , respectively. The threshold expression is used only for calculating R-factors etc. and it is not relevant to the choice of reflections for refinement. The program used for refinement, Jana2006, uses the weighting scheme based on the experimental expectations, see _refine_ls_weighting_details, that does not force S to be one. Therefore the values of S are usually larger than the ones from the SHELX program.