首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Efficient divalent metal cation extractions with di-ionizable calix[4]arene-1,2-crown-4 compounds
Authors:Chuqiao Tu
Institution:Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, 79409-1061 TX, USA
Abstract:Di-ionizable calix4]arene-1,2-crown-4 ethers in the cone conformation were synthesized and their conformation and regioselectivity verified by NMR spectroscopy. These new ligands exhibited high Ba2+ selectivity in competitive solvent extraction of alkaline earth metal cations from aqueous solutions into chloroform. The selectivity order was Ba2+>>Sr2+>Ca2+>Mg2+ with Ba2+/Sr2+ selectivity exceeding 100. The ligands also exhibited high extraction ability for Pb2+ and for Hg2+ in single species extraction. With variation of proton-ionizable groups, which are oxyacetic acid moieties and N-(X)sulfonyl oxyacetamide units with X=methyl, phenyl, 4-nitrophenyl, and trifluoromethyl, ‘tunable’ ligand acidity was obtained.
Keywords:Calixarenes  Crown compounds  Molecular recognition
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号