The title compound, [Cd(2)(NCS)(4)(C(8)H(8)N(2))(4)], is a centrosymmetric dinuclear cadmium(II) complex in which each two metal ions are linked by a pair of thio-cyanate N:S-bridges. Two 2-methyl-benzimidazole N-atom donors and one terminal thio-cyanate N atom complete a highly distorted square-pyramidal geometry around the Cd atom. In the crystal structure, two N-H⋯S hydrogen-bonding inter-actions occur, resulting in a three-dimensional polymeric structure. The apical 2-methyl-benzimidazole ring and its symmetry-related counterpart are arranged in an anti-parallel manner with a centroid-centroid separation of 3.6050 (14) Å, indicative of a π-π inter-action.
In the crystal structure of the title compound, C(8)H(9)N(2) (+)·SCN(-), the nearly planar 2-methyl-benzimidazolium cation [r.m.s. deviation = 0.0123 (4) Å] is perpendicular to a mirror plane and the methyl H atoms are disordered about the mirror plane with equal occupancies. The thio-cyanate anion also lies on a mirror plane. N-H⋯N hydrogen bonds link the components into an infinite chain along the b axis.
In the crystal structure of the title compound, C(8)H(9)N(2) (+)·SCN(-)·C(8)H(8)N(2), the three components are linked by inter-molecular N-H⋯N and N-H⋯S hydrogen bonds into infinite chains along the c axis.