One- and Two-dimensional Coordination Polymers of Cadmium Complexes Bridged by 4,4′-Trimethylenebipyridine Ligands

Abstract

Three new cadmium coordination polymers, [CdBr2(tmdp)2(μ-tmdp)2] n ·n(H2O) (1), [Cd(SCN)2(μ-tmdp)2] n ·2n(PhS) (2) and [Cd(SCN)2(μ-tmdp)2] n ·n(Ph2S2)·n(CH3CN) (3) (tmdp = 4,4′-trimethylenedipyridine), have been synthesized under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction analysis. The geometry around cadmium is a slightly distorted octahedron with four tmdp and two Br- or SCN- ligands. Complex 1 represents a one-dimensional structure, whereas complexes 2 and 3 are two-dimensional coordination polymers. The rhombic channels of the coordination network of 2 and 3 are occupied by 1D polymeric (PhS) n and diphenyl disulfide (Ph2S2) molecules, respectively. The photoluminescent properties of coordination polymers 1–3 were investigated in solid state at room temperature. The TGA experiments showed that these three complexes were quite thermally stable. Three new cadmium coordination polymers have been synthesized under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction analysis. The rhombic channels of the two-dimensional coordination networks are occupied by one-dimensional polymeric (PhS)n and diphenyl disulfide (Ph2S2) molecules.