Synthesis and Thermal Decomposition Kinetics of La(Ⅲ) Complex with Unsymmetrical Schiff Base Zwitterion Ligand
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Xie Sitan Bi Caifeng Xu Jiakun Xiao Yan Fan Yuhua
Key words：unsymmetrical Schiff base ligand; La(Ⅲ) complex; thermal decomposition; non-isothermal kinetics; rare earths;
Abstract: A new unsymmetrical solid Schiff base (LLi) was synthesized using L-lysine. o-vanillin and 2-hydroxy-l-naph-thaldehyde. Solid La (Ⅲ) complex of this ligand [LaL(NO3)](NO3)·2H2O was prepared and characterized by elemental analyses, IR, UV and molar conductance. The thermal decomposition kinetics of the complex for the second stage were studied under non-isothermal condition by TG and DTG methods. The kinetic equation may be expressed as: dα/dt=A·e-E/RT·(1-α)2. The kinetic parameters (E, A), activation entropy ΔS≠ and activation free-energy ΔG≠ were also gained.
Xie Sitan1，Bi Caifeng1，Xu Jiakun1，Xiao Yan1，Fan Yuhua1
(1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China)
Abstract:A new unsymmetrical solid Schiff base (LLi) was synthesized using L-lysine. o-vanillin and 2-hydroxy-l-naph-thaldehyde. Solid La (Ⅲ) complex of this ligand [LaL(NO3)](NO3)·2H2O was prepared and characterized by elemental analyses, IR, UV and molar conductance. The thermal decomposition kinetics of the complex for the second stage were studied under non-isothermal condition by TG and DTG methods. The kinetic equation may be expressed as: dα/dt=A·e-E/RT·(1-α)2. The kinetic parameters (E, A), activation entropy ΔS≠ and activation free-energy ΔG≠ were also gained.
Key words:unsymmetrical Schiff base ligand; La(Ⅲ) complex; thermal decomposition; non-isothermal kinetics; rare earths;
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