Electrical conductivity, spectral and magnetic properties of some transition metal complexes derived from dimedone bis(4-phenylthiosemicarbazone)

Abstract

CoII, NiII, CuII, ZnII, CdII and UVIO2 complexes of 5, 5-dimethyl-1, 3-cyclohexanone bis(4-phenylthiosemicarbazone), H2CPT, have been characterized by elemental analysis, i.r. and reflectance spectral studies, and magnetic moment measurements. I.r. spectra show that H2CPT gives rise to dibasic quadridentate SNNS donor. A square-planar structure is proposed for the copper(II) complex and octahedral for cobalt(II) and nickel(II) complexes according to the magnetic and electronic spectral data. The electrical conductivities of H2CPT and its COII, NiII, CuII and CdII complexes were measured. The positive temperature coefficient (dδ/dT) and the higher activation energies of H2CPT and its CdII and CuII complexes is evidence of their semiconducting character.