New 5,17-(di-ionizable)-25,26,27,28-tetraalkoxycalix[4]arene ligands: synthesis and selected divalent metal ion extractions
作者:Pillhun Son、Gaurav Arora、Jennifer D. Crawford、Eun Kyung Lee、Louisa J. Hope-Weeks、Kazimierz Surowiec、Richard A. Bartsch
DOI:10.1007/s10847-015-0474-2
日期:2015.4
Four new series of 5,17-(di-ionizable)-25,26,26,28-tetraalkoxycalix[4]arene ligands are prepared. The ionizable groups are carboxylic acid and N-(Z)sulfonyl formamide functions with Z = –Me, –Ph, –C6H4–4-NO2, and –CF3. When the four alkoxy groups are methoxy, the ligand conformation is flexible. With four butoxy groups, the ligands are locked in cone, partial-cone, or 1,3-alternate conformations. Complexation abilities of the new ligands are evaluated in solvent extractions of selected divalent metal ions from aqueous solutions into chloroform. Both the conformation of the calix[4]arene unit and identity of the acidic group are found to influence the divalent metal ion extraction selectivity and efficiency.
四种新的5,17-(双离子化)-25,26,26,28-四烷氧基杯芳烃配体被制备。离子化基团为羧酸和N-(Z)磺酰甲酰胺功能团,其中Z = –Me、–Ph、–C6H4–4-NO2和–CF3。当四个烷氧基为甲氧基时,配体构象是灵活的。使用四个丁氧基时,配体被锁定在锥形、部分锥形或1,3-交替构象中。新配体的络合能力在从水相溶液提取选定的二价金属离子到氯仿的溶剂萃取中进行了评估。研究发现,杯芳烃单元的构象和酸性基团的性质都会影响二价金属离子的萃取选择性和效率。