糠醛缩4-氨基安替比林与Ln(Ⅲ)配合物的合成、表征和热分解反应动力学

Synthesis,Characterization and Thermodecomposition Kinetics of Ln(Ⅲ) Complexes with Furfural-4-aminoantipyrine

合成了稀土硝酸盐与希夫碱糠醛缩4-氨基安替比林(C16H15N3O2,以L表示)的3种固体配合物。通过元素分析、热分析、红外光谱、紫外光谱和摩尔电导等分析技术,确定配合物的组成为[LnL(NO3)3-(CH3OH)].H2O(Ln为La、Pr、Eu)。用非等温热重分析方法研究了La(Ⅲ)配合物的热分解反应动力学,推断出第3步热分解的动力学方程为:dα/dt=A.e-E/RT.3/2[(1-α)-1/3-1]-1,并计算出了该步热分解的活化熵ΔS≠和活化吉布斯自由能ΔG≠分别为-79.84 J/(mo.lK)和120.6 kJ/mo。

Three solid complexes of Schiff base C16H15N3O2 （L） derived from Furfural and 4-aminoantipyrine with each of 3 lanthanide nitrates were synthesized and characterized by elemental analysis, IR, UV, TG-DTG and molar conductivity analysis. The compositions of the complexes were confirmed to be [LnL（NO3）3-（CH3OH）]·H2O（ Ln = Pr, La, Eu）. The third-stage thermal decomposition kinetics of the complexes was studied under non-isothermal condition by TG and DTG methods. The kinetic equation may be expressed as：da/dt=A·e^-E/RT·3/2[（1-α）^-1/3-1]^-1. The kinetic parameters（ E, A）, activation entropy △S^≠ and activation free-energy △G^≠ were also obtained.