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The reaction of a cobalt(II) salt with 4-(dimethyl-amino)pyridinium hydro-bromide perbromide yielded the title compound, (C(7)H(11)N(2))[CoBr(3)(C(7)H(9.1)Br(0.9)N(2))]. In the anion, the Co(II) atom is coordinated in a distorted tetra-hedral geometry by three Br atoms and the pyridine N atom of a bromine-substituted 4-(dimethyl-amino)pyridine mol-ecule, whose formation probably results from an incomplete substitution (90%) catalysed by the Co(II) ion. One of the three bromine atoms bonded to the metal is disordered over two sites in a 0.9:0.1 ratio. An N-H⋯Br hydrogen bond connects the cation and anion.

4-(Dimethylamino)pyridinium tribromido{3-[bromo/hydro(0.9/0.1)]-4-(dimethylamino)pyridine-κN1}cobaltate(II)

4-(Dimethylamino)pyridinium tribromido{3-[bromo/hydro(0.9/0.1)]-4-(dimethylamino)pyridine-κN¹}cobaltate(II)