Abstrato

Thermal analysis and thermokinetics studies on homobinuclear CuII, CoII, NiII and CdII complexes with 4-amino -3,5-di(2- Pyridyl)1,2,4-triazole

D.M.Fouad, M.A.El-Gahami

A series of Cu(II), Co(II), Ni(II)and Cd(II) complexes with 4-amino -1,2,4- triazole-3,5-di(2-Pyridyl)(abpt) have been prepared. The structure of the complexes was determined by means of element analysis, molar conductance, infrared and electronic spectra and thermal studies. The thermal decomposition study of the prepared complexes was monitored by TG, DTGand DTAanalysis in dynamic atmosphere of nitrogen. TG,DTG and DTAstudies confirmed the chemical formulations of these complexes. The kinetic parameters were determined from the thermal decomposition data using the graphical methods of Coats-Redfern and Horwitz- Metzger. Thermodynamic parameters were calculated using standard relations. The values of the activation energy increases by the increase of the step number, this may be attributed to the structural rigidity of the ligands. The decomposition stability order of the complexes depends on the metal used.