College of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi 435002, CHINA
A complex of Cu(II) with 1-(6-HydroxyNaphthalen-2-yl) Butane-1,3-Dione (HNBD) was synthesized and characterized by elemental analysis, IR, UV and DTA-TG-DTG techniques. IR spectra as well as UV-visible absorption measurements indicated that Cu(II) ion was coordinated to the HNBD ligand. The TG-DTA-DTG curves showed that thermal decomposition of the anhydrous complex was a two-stage process and the residue of decomposition was CuO. The decomposition mechanism and non-isothermal kinetic parameters of the complex were obtained from the analysis of TG-DTG data using three kinds of integral methods (Coat-Redfern equation, HM equation, MKN equation) and differential method (Achar equation). The results indicate that the kinetic equations with parameters describing the thermal decomposition reaction are with E = 417.78 kJ/mol, A = 3.53´1038/s, DS = 487.55 J/K·mol and n =3 for the first stage, with E = 88.76 kJ/mol, A = 4.74´105, DS = -144.59 J/K/mol and n =2 for the second stage.
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