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Synthesis and Thermal Decomposition Kinetics of Two Dy(III) Complexes with Benzoate Derivative and 2,2′‐Bipyridine as Co‐ligands
Author(s) -
Tian Liang,
Wu Kezhong,
Zhang Caixia,
Zhang Jianjun
Publication year - 2009
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200990357
Subject(s) - thermogravimetry , chemistry , thermal decomposition , differential thermal analysis , decomposition , derivative (finance) , infrared spectroscopy , 2,2' bipyridine , chemical process of decomposition , isothermal process , kinetics , activation energy , bipyridine , inorganic chemistry , crystallography , organic chemistry , crystal structure , thermodynamics , diffraction , financial economics , optics , economics , quantum mechanics , physics
Two Dy(III) complexes with benzoate derivative and 2,2′‐bipyridine ligands, [Dy(2,4‐DClBA) 3 bipy] 2 and [Dy( o ‐MOBA) 3 bipy] 2 ·4H 2 O (2,4‐DClBA=2,4‐dichlorobenzoate; o ‐MOBA= o ‐methoxybenzoate; bipy=2,2′‐bipyridine), were prepared and characterized by elemental analysis, infrared spectra, ultraviolet spectra and thermogravimetry and differential thermogravimetry techniques. The thermal decomposition behavior of the two complexes under a static air atmosphere was discussed by thermogravimetry, differential thermogravimetry and infrared spectral techniques. The non‐isothermal kinetics were investigated by using a double equal‐double step method, a non‐linear isoconversional integral method and a Starink method. The mechanism functions of the first decomposition step for [Dy(2,4‐DClBA) 3 bipy] 2 and the second decomposition step for [Dy( o ‐MOBA) 3 bipy] 2 ·4H 2 O were determined. Meanwhile, the thermodynamic parameters (Δ H ne; , Δ G ne; and Δ S ne; ) and kinetic parameters (activation energy E and the pre‐exponential factor A ) for the two complexes were also calculated.