稀土异双希夫碱配合物的合成、表征及热分解反应动力学

Synthesis, Characterization and Thermodecomposition Kinetics of Unsymmetrical Schiff Base with Rare Earths

邻苯二胺与 5 氯 2 羟基二苯酮、水杨醛作用合成了一种异双四齿希夫碱配体C2 6 H1 9N2 O2 (H2 L)。在正丁醇和甲醇体系中稀土硝酸盐与该配体反应合成了 3种稀土希夫碱配合物 [RE(HL) (NO3) 2 (H2 O) ]·H2 O(RE =La ,Pr,Nd)。通过元素分析 ,IR ,UV ,TG DTG及摩尔电导分析等手段对合成的配合物进行了表征 ,并用非等温热重法研究了La(Ⅲ )配合物的热分解反应动力学。推断出第三步热分解反应动力学方程为 :dα/dt=A·e-E/RT·3 / 2 [( 1-α) - 1 /3-1] - 1 。

An unsymmetrical tetradentate Schiff base ligand (H 2L) was synthesized using 5 chloro 2 hydroxybenzophenone, o phenylenediamine and salicylaldehyde. Three rare earth ion complexes of this ligand [RE(HL) (NO 3) 2(H 2O)]·H 2O (RE=La, Pr, Nd) were prepared and characterized by elemental analysis, IR, UV and molar conductance analysis. The thermodecomposition kinetics of La(Ⅲ) complex for the third decomposition stage was studied under non isothermal condition by TG and DTG methods. The kinetic equation may be expressed as: d α /d t = A·e - E/RT ·3/2[(1- α ) -1/3 -1] -1 .