Inorganic–Organic Hybrid Materials: Synthesis and X-Ray Structure of N, N′-Dimethylimidazolium Salts [(Me 2Im) 2][Cd 2(SCN) 6] and N, N′-Dicyclohexylimidazolium [(Cy 2Im) 2][Cd 2(SCN) 6]·C 3H 6O

Abstract

Two novel N, N′-dialkylimidazolium thiocyanate–cadmium complexes [( R 2Im) 2][Cd 2(SCN) 6] for R=Me (3), and cyclohexyl (4) have been synthesized and characterized by single-crystal X-ray diffraction. Compound 3 crystallizes in the monoclinic unit cell dimensions of 17.468(3), 7.7273(12), 10.6750(16) Å, 104.833(2)°, and space group C2 with two [(Me 2Im) 2] [Cd 2(SCN) 6] per unit cell. The two cadmium atoms in 3 are octahedrally coordinated in 4 N2 S and 2 N4 S coordination environment, and linking into one-dimensional zigzag chains. Compound 4 belongs to the monoclinic space group Cc with unit cell of dimensions 13.3049(12), 17.5550(16), 20.8012(19) Å, 101.494(2)°, and four [(Cy 2Im) 2][Cd 2(SCN) 6]·C 3H 6O per unit cell. The cadmium atoms in 4 are all 3 N3 S hexa-coordinated with six bridging SCN − ions in an fac configuration and form infinite zigzag polymeric chains. The infinite chains in 3 form an approximate hexagonal array, making triangular channels which are occupied by N, N′-dimethylimidazolium ions, whereas the chains in 4 form layered structure, and the layers are stacked perpendicularly with respect to the orientation of the infinite anionic chains alternatively. N, N′-dicyclohexylimidazolium cations and solvent molecules fill in between layers.