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In the title compound, [Co(C(16)H(14)N(4)O)(2)](C(6)H(2)N(3)O(7))(2)·3CH(3)CN, the Co(II) ion is located on a crystallographic twofold rotation axis and is coordinated in a slightly distorted tetra-hedral environment by four N atoms from the two bidentate N-heterocycles. The crystal structure is stabilized by inter-molecular N-H⋯O and N-H⋯N hydrogen bonds. One of the acetonitrile solvent mol-ecules also lies on a twofold rotation axis.

In the title compound, C(30)H(26)N(4)O, the dihedral angle between the two benzimidazole rings is 69.35 (9)°. The dihedral angles between the benzimidazole ring system and the phenyl ring are 76.79 (12) and 86.10 (11)° in the two benzyl-benzimidazole moieties.