In situ preparation, structures, photoluminescence and semiconductor properties of two novel cadmium compounds

Two novel cadmium compounds (me2-4,4'-H2bipy)9[(CdCl3)-HCl-(CdCl3)](CdCl3)4(CdCl4)6 (1) and (me2-4,4'-H2bipy)9[(CdCl3)-HCl-(CdCl3)]3[CdCl4(H2O)]6 (2) (me = methyl; 4,4'-bipy = 4,4'-bipyridine) have been synthesized through solvothermal reactions and their crystal structures were determined by single-crystal X-ray diffraction technique. The me2-4,4'-H2bipy moiety was obtained via in situ reactions. The single-crystal X-ray diffraction analyses revealed that both compounds are crystallized in the P3(–)1c space group of the hexagonal system and both are characterized by a 0-D isolated structure. Powder photoluminescent characterization reveals that compounds 1 and 2 show an emission in the blue or red region of the spectrum. Compounds 1 and 2 possess wide energy band gaps of 3.49 and 5.01 eV as found by the solid-state UV/Vis diffuse reflectance spectrum.