Two new cobalt(II) schiff base complexes were prepared and characterized by elemental analyses, IR spectra and thermal analyses. The compositions of the complexes were also determined. Saturated oxygen uptake of the complexes in CH3CN solvent at different temperatures was obtained by manometric oxygen-uptake measurements. Oxygenation equilibrium constants and its thermodynamic parameters ΔHⅲ , ΔSⅲ were calculated from the above measurements. The effects of temperature and ligand structure on oxygenation were discussed. The thermal stability and non-isothermal kinetics of thermal decomposition reaction were also investigated by TG-DTG technique. the possible reaction mechanisms of their first step of thermodecomposition were deduced by means of integral and differential equations.

Key words: INFRARED SPECTROPHOTOMETRY, REACTION KINETICS, METHIONINE, ELEMENTAL ANALYSIS, THERMAL STABILITY, THERMOGRAVIMETRY, COBALT COMPLEX, SCHIFF BASE, THERMAL DECOMPOSITION, SALICYLIC ALDEHYDE