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The asymmetric unit of the title compound, (C 19 H 18 N 3 ) 2 [Cu 2 Br 4 ], 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—H⋯Br hydrogen bonds link the mol­ecules. There is a C—H⋯π contact between the cyano­benzyl ring and the anion; π—π 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].

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