Thermal decomposition of bis-(DL-valinato)copper(II) and bis-(DL-methioninato)copper(II)

Abstract

A kinetic study of the thermal decomposition of the complexes bis-(DL-valinato)copper(II) and bis-(DL-methioninato)copper(ll) was carried out using thermogravimetry in a dynamic regime, following the theoretical model of ~ttava and including the equation used by Johnson 1 and Gallagher: ---1 = kt. Kinetic parameters were calculated and are compared with those obtained previously for the complex bis-(L-tryptophanato)copper(! I). The sequence of thermal stability found is:Little has been published till now on the solid ~solid + gas reactions of the bis-(aminoacidato)Cu(II) complexes. Olafson and Byran [1] studied the thermal decomposition of some bis-(aminoacidato)Cu(II) complexes by differential scanning calorimetry, and Gili and de la Fuente [2] described the thermal decomposition of the complex bis-(L-tryptophanato)copper(II) using thermogravimetry.In this work we report for the first time a kinetic study of the thermal decomposition in the solid phase of the complexes bis-(DL-valinato)-copper(II) and bis-(DL-methioninato)copper(II) (abbreviated Cu(DL-Val)2 and Cu(DLMet)2, respectively). This study has been carried out using thermogravimetry in a dynamic regime following the theoretical model of gatava [3] and including the