室温固相法合成席夫碱钍(Ⅳ)金属配合物

Synthesis of Thorium(Ⅳ) Complexes with Schiff Base Ligands at Room Temperature by Solid Phase Method

以水杨醛或邻香草醛、2,6-二氨基吡啶和硝酸钍为原料,采用室温固相法合成了2,6-二氨基吡啶双席夫碱钍(Ⅳ)配合物[ThL1(NO3)2](NO3)2.H2O,[ThL2(NO3)2](NO3)2.H2O。通过元素分析、EDTA滴定法、红外光谱、紫外光谱、热分析方法对配合物的组成和结构进行了表征。结果表明,金属钍与席夫碱配体中的亚氨基上的氮原子、酚氧基上的氧原子以及硝酸根离子形成了配位数为8的配合物。配合物的热分解过程包括失水、配体的氧化分解和氧化为氧化钍。

Thorium （Ⅳ） complexes of bis-Schiff base were synthesized at room temperature using solid phase method by taking salicylaldehyde, o-vanillin, 2,6-pyridinediamine and thorium nitrate as base materials. The structures and compositions of them were characterized by means ,of elemental analysis, method of EDTA titration, infrared spectrum, ultraviolet spectrum and TG-DTA analysis. Their compositions were [ ThL1 （ NO3 ）2 ] （ NO3 ）2·H20 and [ ThL2 （ NO3 ）2 ] （ NO3 ） 2·H2O respectively. The experimental results demonstrate that the thorium ion was coordinated through the Schiff base ligands as terdentate with O, N from phenolic, imino groups, and nitric acid mot respectively; the coordination number of thorium ion was eight. Thermal decomposition of the complexes proceeds in three stages： dehydration ,oxidation pyrolysis of the ligands, and the final oxidized residues of thorium oxide.