2-(N-methylimidazole-2′-yl-thiomethyl)benzimidazole (L) has been synthesised and the complexes [ML2(ClO4)2]·2H2O (M = Ni or Cu) and [MLX2] nH2O (M = Cu, X = Cl or Br, n = 0; M = Ni, X = Cl, n = 3; M = Ni, X = Br, n = 0) prepared and characterised. Proposed geometries for the complexes are: octahedral geometry for perchlorate complexes; tetrahedral geometry for chloro-and bromo-complexes; dimeric square pyramidal for the chloro-complex of copper(II).