THERMAL DEGRADATION BEHAVIOR OF SOME POLY(4-AMINO-2,6-PYRIMIDINODITHIOCARBAMATE) METAL COMPLEXES

The thermal decomposition behavior of the Fe(II), Co(II), and Ni(II) complexes of poly(4-amino-2,6- pyrimidinodithiocarbamate) has been investigated by thermogravimetric analysis (TGA) at a heating rate of 10°C min -1 under nitrogen. The Coats-Redfern integral method is used to evaluate the kinetic parameters for the successive steps in the decomposition sequence observed in the TGA curves. The processes of thermal decomposition taking place in the three complexes are studied comparatively as the TGA and DTA curves indicate the difference in the thermal decomposition behavior. The thermal stabilities for the release of coordinated water, chlorine atoms and then decomposition of the backbone structure that occur in the sequential decomposition of these complexes is discussed in terms of electronegativity and ionic size effects. However, their kinetic parameters are of inconsistent variation.