Semiconducting properties of some newly synthesized mixed-metal, mixed-ligand complexes. III.

Heterobimetallic complexes of the type MHg(xant)(2)(dtc)(2) [M = Ni(II) or Zn(II); xant = ethyl xanthate, dtc = diethyl dithiocarbamate], PdHgCl2(dtc)(2) and PhHg(dtc)M(xant)(2) [M = Cd(II), Zn(II) or Pb(II)] have been prepared and characterized by elemental analyses, molar conductance, magnetic susceptibility, IR, UV-Visible and H-1 NMR spectral studies. The diamagnetic nature and electronic spectral studies suggest a square-planar environment around Ni(II) and Pd(II) in the heterobimetallic complexes. IR bands, together with H-1 NMR spectral studies, indicate the bridging/bidentate behaviour of the rant and dtc groups. Solid state electrical conductivities of compacted pellets suggest that all the complexes behave as typical semiconductors as their conductivities were found to increase with an increase in temperature from 308 to 328 K. The band gaps evaluated from the plot of conductivity against reciprocal temperature (0.106-0.3 eV) is indicative of their semiconducting behaviour.