Efficient divalent metal cation extractions with di-ionizable calix[4]arene-1,2-crown-4 compounds
作者： Chuqiao Tu , Kazimierz Surowiec , Richard A. Bartsch
DOI: 10.1016/J.TET.2007.02.105
关键词:
摘要: Di-ionizable calix[4]arene-1,2-crown-4 ethers in the cone conformation were synthesized and their regioselectivity verified by NMR spectroscopy. These new ligands exhibited high Ba2+ selectivity competitive solvent extraction of alkaline earth metal cations from aqueous solutions into chloroform. The order was Ba2+>>Sr2+>Ca2+>Mg2+ with Ba2+/Sr2+ exceeding 100. also ability for Pb2+ Hg2+ single species extraction. With variation proton-ionizable groups, which are oxyacetic acid moieties N-(X)sulfonyl oxyacetamide units X=methyl, phenyl, 4-nitrophenyl, trifluoromethyl, ‘tunable’ ligand acidity obtained.
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