Synthesis, Spectral Characterization, Thermal Studies and DC Electrical Conductivity of Poly[di(2,5-dimercapto-1,3,4-thiadiazole)-Platinum (IV)] Complex

摘要

[Poly[di(2,5-dimercapto-1,3,4-thiadiazole)]-Pt(IV)] complex [PDMT-Pt(IV)] was prepared by the reaction 2,5-dimercapto-1,3,4-thiadiazole with hydrogen hexachloroplatinate (IV) hydrate in a 2:1 molar ratio in mixture of methanol and water (1:8) under reflux for 24 h. The complex was characterized by elemental analyses, electronic spectra, FTIR spectroscopy, magnetic susceptibility, thermal analyses (TGA and DTA) and X-Ray diffraction. The results obtained are consistent with the proposed structure. The DC electrical conductivity variation with a temperature in the range 300-500 K was studied after annealing for 24 h at 100oC and after doping with 5% I2, for comparison. The complex behaved as a typical semiconductor with regard to an increase of conductivity with heat. The annealed and doped complex gave a DC electrical conductivity of 10-9 S cm-1 and 5.6×10-9 S cm-1 at high temperature, respectively. The DC electrical conductivity behavior was interpreted using the band theory.