The crystal and mol. structure of Co(py)4Cl2譎2O have been determine from three-dimension x-ray diffraction data collected on a four-circle diffractometer. The compound crystallizes in the P21/h space group with a = 0.9361(6), b = 1.6278(9), c = 1.3878(7) nm, b = 94.01(5)? Z = 4. The thermal decomposition process of the compound has also been studied using TG and DTG techniques under non-isothermal condition; kinetic parameters were obtained from analyses of the TG and DTG curves by integral and differential methods. The possible reaction mechanism was suggested by comparison of the kinetic parameters. Its kinetic equation may be expressed as: da/dt = A譭-E/RT?/2(1-a)2/3譡1-(1-a)1/3]-1. The math. expression of the kinetic compensation effect of the thermal decomposition reaction is 1n A = 0.3341E-2.715.

Key words: PYRIDINE P, CHLORIDE, COBALT COMPLEX, TRANSITION METAL COMPLEX