无溶剂法合成氨基酸水杨醛席夫碱锌的配合物

Synthesis of the Zinc(II) Complexes with Schiff Base Ligands Derived from Salicylaldehyde and Amino Acids by Solvent-free Method

摘要:

以L-丙氨酸或L-亮氨酸及水杨醛、乙酸锌为原料，通过无溶剂一步法合成了氨基酸水杨醛席夫碱锌(II)配合物[ZnL(H2O)]?nH2O（L = sal-ala，sal-leu），用EDTA滴定法、元素分析、红外光谱、X射线粉末衍射、热分析等手段对配合物的组成和结构进行了表征。结果表明，锌分别与席夫碱配体中的亚胺基氮、羧基氧、酚羟基氧以及水分子中的氧形成了配位数为4的配合物，其热分解包括失水、配体的氧化分解过程，最后完全分解为氧化锌。

Abstract:

The zinc(II) complexes of the amino acids Schiff bases had been synthesized by one-step solvent-free reaction with L-leucine or L-alanine, salicylaldehyde and zinc acetate as materials. The compositions and structures of the complexes had been characterized by EDTA titration, elemental analysis, IR spectrum, X-ray powder diffraction and TG-DSC analysis. The compositions of two complexes are [ZnL(H2O)]?nH2O (L = sal-ala, sal-leu). Infrared spectra and the thermal decomposition process of the complexes show the presence of coordination water molecules. The zinc ion is coordinated through the Schiff base ligands as terdentate with O, O and N donors from carboxylic, phenolic and imino groups, and O donors from water molecule respectively. The coordination numbers of zinc ion is four. Thermal decomposition of the complexes proceeds in several stages: dehydration, oxidation pyrolysis of the ligands, and the final residues are zinc oxide.