Obtenção e estudo do comportamento térmico dos complexos de La e Mn com 8-hidroxiquinolina no estado sólido

Abstract

This paper presents the study of the obtainment and thermal behavior of lanthanum and manganese complexes with 8-hydroxyquinoline, in order to obtain oxides of lanthanum and manganese from the thermal decomposition of complexes formed.. These complexes were obtained at pH 10 and at temperatures of 25 and 60° C. The study by TG/DTA under an atmosphere of synthetic air and heating rates of 5, 10 and 20° C min-1, which indicated that the thermal stability of the complexes are very close to each other and that their thermal behavior is influenced by the conditions of analysis, generating waste oxides of different stoichiometry. The method of kinetic rates of multiple heating is efficient for studying the thermal decomposition chelates of lanthanum and manganese at different temperatures and different rates of heating. Using multiple kinetic method described heating rates could be determined by Arrhenius activation energy, the pre-exponential factor and the half-life of the compound and thus discuss them in terms of different temperatures.