New di-ionizable p-tert-butylcalix[4]arene-1,2-crown-4 ligands: synthesis and divalent metal ion extraction
摘要:
New di-ionizable p-tert-butylcalix[4]arene-1,2-crown-4 ligands with elongated side arms in cone, partial-cone, and 1,2-alternate conformations of the calixarene scaffold are prepared and characterized. The acidic groups on the side arms include carboxylic acid and N-(X)sulfonyl carboxamide with X variation of -Me, -Ph, -C6H4-4-NO2, and -CF3. Solvent extractions of alkaline earth metal cations, Hg2+, and Pb2+ from aqueous solutions into chloroform are employed to probe the effects of these structural modifications on the divalent metal ion complexation behavior of the new ligands. (c) 2012 Elsevier Ltd. All rights reserved.
New di-ionizable p-tert-butylcalix[4]arene-1,2-crown-4 ligands: synthesis and divalent metal ion extraction
作者:Amanda L. Boston、Eun Kyung Lee、Jennifer D. Crawford、Robert E. Hanes、Richard A. Bartsch
DOI:10.1016/j.tet.2012.09.065
日期:2012.12
New di-ionizable p-tert-butylcalix[4]arene-1,2-crown-4 ligands with elongated side arms in cone, partial-cone, and 1,2-alternate conformations of the calixarene scaffold are prepared and characterized. The acidic groups on the side arms include carboxylic acid and N-(X)sulfonyl carboxamide with X variation of -Me, -Ph, -C6H4-4-NO2, and -CF3. Solvent extractions of alkaline earth metal cations, Hg2+, and Pb2+ from aqueous solutions into chloroform are employed to probe the effects of these structural modifications on the divalent metal ion complexation behavior of the new ligands. (c) 2012 Elsevier Ltd. All rights reserved.