THERMOGRAVIMETRIC AND DIELECTRIC-RELAXATION SPECTROSCOPY OF A THIOSEMICARBAZIDE SCHIFF-BASE AND ITS METAL-COMPLEXES

The thermal and dielectric spectroscopy of a thiosemicarbazide Schiff base and its nickel and palladium complexes were studied. The Perkin E lmer TGA7 thermal analysis technique was applied to study the effect o f the heating rate on the TG curve. A Hioki 3520 RLC tester was used t o measure the dielectric spectroscopy in the frequency range 10(2)-10( 5) HZ. The activation energies of the ligand and its complexes were de termined, and the d.c. and a.c, conductivities were estimated for the ligand and its Ni(II) complex. The results showed that the Ni(II) comp lex was present in a dimeric form, while the Pd(II) complex was presen t in a monomeric form. The insertion of a nickel atom increases the d. c. conductivity. The mechanism of conduction is discussed.