Dibromido(6-methyl-2,2′-bipyridine-κ2 N,N′)zinc(II)

In the title compound, [ZnBr2(C11H10N2)], the ZnII atom is four-coordinated in a distorted tetrahedral configuration by two N atoms from a 6-methyl-2,2′-bipyridine ligand and two terminal Br atoms. Weak intermolecular C—H⋯Br hydrogen bonds and π–π stacking interactions between the pyridine rings [centroid–centroid distances = 3.763 (5) and 3.835 (6) Å] contribute to crystal-packing effects.

We are grateful to the Islamic Azad University, Shahr-e-Rey Branch, for financial support.
Here, we report the synthesis and structure of the title compound, [Zn(C 11 H 10 N 2 )Br 2 ].
In the crystal structure, weak intermolecular C-H···Br hydrogen bonds (Table 2)

Experimental
For the preparation of the title compound, a solution of 6-methyl-2,2'-bipyridine (0.16 g, 0.15 ml 0.94 mmol) in methanol (10 ml) was added to a solution of ZnBr 2 (0.21 g, 0.94 mmol) in acetonitrile (30 ml) and the resulting colorless solution was stirred for 20 min at 313 K. This solution was left to evaporate slowly at room temperature. After one week, colorless prismatic crystals of the title compound were isolated (yield 0.28 g, 75.3%).

Refinement
All H atoms were positioned geometrically, with C-H = 0.93Å for aromatics H, C-H = 0.96Å for methyl and constrained to ride on their parent atoms, with U iso (H) = 1.2U eq . High values for Δρ are related to the poor quality of the crystals. Fig. 1. The molecular structure of the title molecule, [Zn(C 11 H 10 N 2 )Br 2 ], with the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level.