Acta Cryst. (2008). E64, m485-m486  [ doi:10.1107/S160053680800439X ]

Bis(2,6-dimethylpyridinium) tetrabromidocobaltate(II)

B. F. Ali, R. H. Al-Far and S. F. Haddad

Abstract: In the crystal structure of the title compound, (C₇H₁₀N)₂[CoBr₄], the [CoBr₄]^2- anion is connected to two cations through N-HBr and H₂C-HBr hydrogen bonds to form two-dimensional cation-anion-cation layers normal to the crystallographic b axis. Interactions of the - type are absent between cations in the stacks [centroid-centroid separation = 5.01 (5) Å]. Significant intermolecular Br-aryl interactions are present in the structure, especially an unusually short Br-ring centroid interaction of 3.78 (1) Å. The coordination geometry of the anion is approximately tetrahedral and a twofold rotation axis passes through the Co atom.

Online 20 February 2008

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