Iodido{4-Phenyl-1-[1-(1,3-Thiazol-2-Yl-Kappa N)Ethylidene]Thiosemicarbazidato-Kappa N-2 ',S}{4-Phenyl-1-[1-(1,3-Thiazol-2-Yl)Ethylidene]Thiosemicarbazide-Kappa S}Cadmium(Ii)

In the title complex, [Cd(C12H11N4S2)I(C12H12N4S2)], the Cd-II ion is pentacoordinated by two thiosemicarbazone ligands (one neutral and the other anionic) and one iodide ion in a distorted square pyramidal (tau = 0.35) geometry. The central ion is coordinated by the thiazole N atom, the thioureido N and the S atom of the deprotonated thiosemicarbazone ligand. The other ligand is linked with the central ion through the C=S group. The deprotonated ligand intramolecularly hydrogen bonds to the thiazole ring N atom, while the ligand forms an intermolecular hydrogen bond to the thiolate S atom of the second ligand. The deprotonation of the tridentate ligand and its coordination to the Cd-II ion via the S atom strikingly affects the C-S bond lengths. The C-S bond lengths in the neutral and deprotonated ligands in the metal complex are 1.709 (3) and 1.748 (2) angstrom, respectively, whereas it is 1.671 (3) angstrom in the free ligand. In the metal complex, the Cd-S distances are 2.6449 (6) and 2.5510 (6) angstrom. The Cd-I bond length is 2.7860 (2) angstrom.