catena-Poly[[(4,4′-dimethyl-2,2′-bipyridine-κ2 N,N′)cadmium]-di-μ-bromido]

In the crystal of the title polymeric compound, [CdBr2(C12H12N2)]n, the CdII cation is located on a twofold rotation axis and is six-coordinated in a distorted octahedral geometry formed by two N atoms from the 4,4′-dimethyl-2,2′-bipyridine ligand and by four bridging Br− anions. The bridging function of the Br− anions leads to a polymeric chain running along the c axis. Weak C—H⋯π interactions observed between adjacent chains are effective in the stabilization of the three-dimensional packing.

In the crystal of the title polymeric compound, [CdBr 2 (C 12 H 12 N 2 )] n , the Cd II cation is located on a twofold rotation axis and is six-coordinated in a distorted octahedral geometry formed by two N atoms from the 4,4 0 -dimethyl-2,2 0bipyridine ligand and by four bridging Br À anions. The bridging function of the Br À anions leads to a polymeric chain running along the c axis. Weak C-HÁ Á Á interactions observed between adjacent chains are effective in the stabilization of the three-dimensional packing.

Experimental
For the preparation of the title compound, a solution of 4,4′-dimethyl-2,2′-bipyridine (0.25 g, 1.33 mmol) in methanol (10 ml) was added to a solution of CdBr 2 .4H 2 O, (0.46 g, 1.33 mmol) in methanol (5 ml) at room temperature. The suitable crystals for X-ray diffraction experiment were obtained by methanol diffusion to a colorless solution in dimethylformamide. Suitable crystals were isolated after one week (yield; 0.45 g, 74.1%).

Refinement
H atoms were positioned geometrically with C-H = 0.93-0.96 Å and constrained to ride on their parent atoms, U iso (H) = 1.2U eq (C).

catena-Poly[[(4,4′-dimethyl-2,2′-bipyridine-κ 2 N,N′)cadmium]-di-µ-bromido]
Crystal data 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 R-factors(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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq  (2)