Thermal decomposition reactions of metal carboxylato complexes in the solid state: II. Thermographic and differential thermal studies of metal oxalato,malonato and succinato complexes |
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| Affiliation: | 1. Science and Technology on Electromagnetic Scattering Laboratory, Shanghai, 200438, China;2. School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China;1. School of Mathematics and Physics, University of Lincoln, Lincoln, United Kingdom;2. Department of Chemical Engineering, Bushehr Branch, Islamic Azad University, Bushehr, Iran |
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| Abstract: | The thermal investigations of metal carboxylato complexes of the first transition metals, Mn(II), Fe(II), Fe(III), Co(II), Ni(II) and Cu(II) and non transition metals like Zn(II) and Cd(II) in solid state were carried out under non-isothermal condition in nitrogen atmopshere by thermogravimetric (TG) and differential thermal analyses (DTA) methods. The results of DTA curves inferred that the thermal stability of the complex decreased approximately with the increase of standard potential of the central metal ion. The thermal parameters like activation energy (Ea1), enthalpy change (ΔH) and entropy change (ΔS) corresponding to deaquation, deammoniation and decomposition processes occurred simultaneously or separately were determined from TG and DTA curves by the standard methods. A linear correlation has been found in the plots of ΔH vs. ΔS and Ea1 vs. ΔS in deaquation, deammoniation and decomposition processes. An irreversible phase transition was noticed for H2[Mn(suc)2] and H2[Co(suc)2] complexes in DTA curves. The residual pyrolysed products were metal carbonates. |
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