INFRARED-SPECTRA OF METAL (II) COMPLEXES OF 1,3,4-THIADIAZOLE-2,5-DITHIOL, 5-AMINO-1,2,4-DITHIAZOL-3-THIONE AND THEIR ACETYL DERIVATIVES

Ail infrared spectral interpretation of the structure of fifteen solid complexes formed by Co(II), Cu(II), Cd(II), Hg(II), Pb(II) 1,3,4-thia diazole-2, 5-dithiol and Zn(II) with ligands (bismuthiol), 5-amino-1,2 ,4-dithiazolin-3-thione (xanthane) and the 2-acetyl-1,3,4-thiadiazol-5 -thione and 5-acetylamide-1,2,4-dithiazol-3-thione derivatives is perf ormed. The coexistence of different tautomers of bismuthiol and xantha ne in the solid state is proposed. The bismuthiol-metal complexes disp lay a unique and similar polymeric structure involving one tautomer. T he xanthane-metal complexation stabilizes the 1,1-dithiolate-type poly meric species; complexation with Cd, Co and Hg metal ions also stabili zes polymers involving the perthiocyanic tautomer.