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

[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.

Keywords:

• poly[di(2,5‐dimercapto‐1,3,4‐thiadiazole)‐platinum(IV)] complex
• 2,5‐dimercapto‐1,3,4‐thiadiazole
• DC electrical conductivity
• doping, thermal analysis
• X‐ray diffraction
• activation energy

5 Acknowledgments

The authors gratefully acknowledge the financial support from TWAS (Grant 04‐053 LDC/CHE/AF/AC).