席夫碱大环的合成及其对稀土金属离子的识别研究  

Study on the Syntheses of Schiff Base Macrocycles and their Recognition for Rare-Earth Ions

作　　者：陈冬梅[1] 欧敏[1] 吴娟[1] 黄超[1] 朱必学[1] 

机构地区：[1]贵州大学大环及超分子化学重点实验室,贵阳550025

出　　处：《化学通报》2015年第5期447-453,共7页Chemistry

基　　金：国家自然科学基金项目(21061003);教育部春晖计划项目(132008)资助

摘　　要：利用2,6-二(2'-甲酰基苯氧亚甲基)吡啶(1)分别与间苯二酚-二(4-氨基苯基)醚(2)和邻苯二酚-二(4-氨基苯基)醚(3)进行缩合得到席夫碱大环化合物L1和L2。用间苯二酚-二(2-甲酰基苯基)醚(4)与2缩合得到席夫碱大环化合物L3。采用1H NMR、IR、质谱和元素分析等对L1、L2和L3的组成进行表征,采用X射线单晶衍射技术测定了L2和L3的晶体结构。用UV-Vis光谱滴定技术对L1、L2和L3与系列稀土离子的键合作用分别进行了考察,结果表明,L1对Ce3+和Eu3+具有选择性识别作用,配位作用的键合比均为1∶1,键合常数依次分别为8.27×103和3.58×103L/mol。Schiff base macrocyclic compounds L1 and L2were synthesized from the reaction of 2,6-bis(2'-formylphenoxymethyl) pyridine(1) with resorcinol-bis(4-aminophenyl) ether(2) and catechol-bis(4-aminophenyl)ether(3) respectively and L3 from the reaction of 2 with 1,3-bis(2'-formyl-phenoxymethyl) benzene(4). Their compositions were characterized by1 H NMR,IR,MS and elemental analysis. The crystal structures of L2 and L3were determined by X-ray diffraction analysis. The reaction of L1~ L3 with a series of rare earth ions were studied by UV-Vis absorption spectra. The results showed that L1 displays selective recognition ability for Ce3 +and Eu3 +,and the JOB plots of the two metal complexes indicate the ligand / metal stoichiometry is 1 ∶ 1. The binding constant(K)determined by UV-Vis titration method is K = 8. 27 × 103L·mol- 1for L1-Ce3 +and K = 3. 58 × 103L·mol- 1for L1-Eu3 +.

关 键 词：席夫碱 大环 晶体结构 稀土离子 识别 

分 类 号：O641.4[理学—物理化学]