Synthesis and thermal decomposition kinetics of two lanthanide complexes with cinnamic acid and 2,2′-Bipyridine
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The two complexes of [Ln(CA)3bipy]2 (Ln = Tb and Dy; CA = cinnamate; bipy = 2,2′-bipyridine) were prepared and characterized by elemental analysis, infrared spectra, ultraviolet spectra, thermogravimetry and differential thermogravimetry techniques. The thermal decomposition behaviors of the two complexes under a static air atmosphere can be discussed by thermogravimetry and differential thermogravimetry and infrared spectra techniques. The non-isothermal kinetics was investigated by using a double equal-double steps method, the nonlinear integral isoconversional method and the Starink method. The mechanism functions of the first decomposition step of the two complexes were determined. The thermodynamic parameters (ΔH ≠ , ΔG ≠ and ΔS ≠ ) and kinetic parameters (activation energy E and the pre-exponential factor A) of the two complexes were also calculated.
KeywordsThermal decomposition mechanism Non-isothermal kinetics Lanthanide complexes
This project was supported by the National Natural Science Foundation of China (No. 20773034), the Natural Science Foundation of Hebei Province (No. B2007000237, No. E2009000307) and Education Department Scientific Research Fund from Hebei Province (2008469).
- 6.Li Y, Zheng FK, Liu X, Zou WQ, Guo GC, Lu CZ, et al. Crystal structures and magnetic and luminescent properties of a series of homodinuclear lanthanide complexes with 4-cyanobenzoic ligand crystal structures and magnetic and luminescent properties of a series of homodinuclear lanthanide complexes with 4-cyanobenzoic ligand. Inorg Chem. 2006;45:6308–16.CrossRefGoogle Scholar
- 7.Li GQ, Li Y, Zou WQ, Chen QY, Zheng FK, Guo GC. Synthesis and crystal structure of a new Lanthanum(III) 4-cyanobenzoate complex. Chin J Struct Chem. 2007;26:575–9.Google Scholar
- 12.Xu XL, Zhang JJ, Yang HF, Ren N, Zhang HY. Synthesis, crystal structure and thermal decomposition of a dysprosium(III) p-fluorobenzoate 1, 10-phenanthroline complex. J Chem Sci. 2007;62b:51–4.Google Scholar
- 16.Guo DF, He J, Zeng ZZ. Studies on interaction between ternary rare earth complexes of cinnamic acid and phenanthroline with DNA by spectroscopy. J Chin Rare Earth Soc. 2004;22:55–60.Google Scholar
- 18.Xie XM, Zeng ZZ. Syntheses, anti-inflammatory action and XPS of Ln (III) -1, 10-phenanthroline-cinnamic acid complexes. J Lanzhou Univ (Nat Sci). 2003;39:64–7.Google Scholar
- 19.Zhang JJ, Ren N. A new kinetic method of processing TA data. Chin J Chem. 2004;22:1459–62.Google Scholar
- 20.Vyazovkin S, Dollimore D. Linear and nonlinear procedures in isoconversional computations of the activation energy of nonisothermal reactions in solids. J Chem Inf Comp Sci. 1996;36:42–5.Google Scholar
- 23.Hu RZ, Gao SL, Zhao FQ, Shi QZ, Zhang TL, Zhang JJ. Thermal Analysis Kinetics. 2nd ed. Beijing: Science Press; 2008. p. 151.Google Scholar
- 24.Wang RF, Jin LP, Wang MZ, Huang SH, Chen XT. Synthesis, crystal structure and luminescence of coordination compound of europium p-methylbenzoate with 2, 2′-Dipyridine. Acta Chim Sin. 1995;53:39–45.Google Scholar
- 25.Shi YZ, Sun XZ, Jiang YH. Spectra and Chemical Identification of Organic Compounds. Nanjing: Science and Technology Press; 1988. p. 98.Google Scholar
- 28.Lu ZR, Ding YC, Xu Y, Li BL, Zhang Y. TA Study on four-one-dimensional chain copper complexes with benzoylacetone or 1, 1, 1-trifluoro-3-(2-thenoyl)-acetone bridged through azobispyridine ligands. Chin J Inorg Chem (in Chinese). 2005;21:181–5.Google Scholar