Acta Cryst. (2008). E64, m1198  [ doi:10.1107/S1600536808026937 ]

Bis[3-allyl-1-(4-cyanobenzyl)-2-methylbenzimidazolium] di--bromido-bis[bromidocuprate(I)]

G.-H. Xu and W. Wang

Abstract: The asymmetric unit of the title compound, (C₁₉H₁₈N₃)₂[Cu₂Br₄], contains one cation and one half-anion; there is a centre of symmetry mid-way between the two Cu atoms. In the cation, the nearly planar benzimidazole ring system is oriented at dihedral angles of 75.31 (3) and 21.39 (3)° with respect to the cyanobenzyl and allyl groups, respectively. The dihedral angle between cyanobenzyl and allyl groups is 87.94 (3)°. In the crystal structure, intermolecular C-HBr hydrogen bonds link the molecules. There is a C-H contact between the cyanobenzyl ring and the anion; - contacts also exist between the benzimidazole ring systems as well as between the anion and the cyanobenzyl ring [centroid-centroid distances = 4.024 (1) and 4.617 (1) Å, respectively].

Online 23 August 2008

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