Synthesis and Thermal Decomposition Kinetics of Two Dy(III) Complexes with Benzoate Derivative and 2,2′‐Bipyridine as Co‐ligands

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.