Iodido{4-phenyl-1-[1-(1,3-thia-zol-2-yl-κN)ethyl-idene]thio-semicarbazidato-κ(2) N',S}{4-phenyl-1-[1-(1,3-thia-zol-2-yl)ethyl-idene]thio-semicarbazide-κS}cadmium(II).

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In the title complex, [Cd(C12H11N4S2)I(C12H12N4S2)], the CdII ion is penta­coordinated by two thio­semicarbazone ligands (one neutral and the other anionic) and one iodide ion in a distorted square pyramidal (τ = 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 CdII 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) Å, respectively, whereas it is 1.671 (3) Å in the free ligand. In the metal complex, the Cd—S distances are 2.6449 (6) and 2.5510 (6) Å. The Cd—I bond length is 2.7860 (2) Å.