期刊
TETRAHEDRON
卷 68, 期 42, 页码 8789-8794出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2012.07.103
关键词
Calixarenes; Crown ethers; Proton-ionizable groups; Metal ion extraction
资金
- Division of Chemical Sciences, Geosciences, and Biosciences of the Office of Basic Energy Sciences of the U.S. Department of Energy [DE-FG02-90ER1445]
Upper rim-functionalized, di-ionizable calix[4]arene-crown-6 ligands are synthesized and compared with structural isomers having the two acidic side arms attached to the lower rim. Solvent extractions of selected divalent metal cations (alkaline earth metal cations, Pb2+, and Hg2+) from aqueous solutions into chloroform by the upper and lower rim-functionalized, di-ionizable calix[4]arene-crown-6 isomers are utilized to assess the effects of this structural modification on metal ion complexation abilities of the ligands. The observed effects are compared with those reported for analogous di-ionizable calix[4]arene-crown-5 structural isomers. (C) 2012 Elsevier Ltd. All rights reserved.
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