Four new series of 5,17-(di-ionizable)-25,26,26,28-tetraalkoxycalixarene 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 calixarene unit and identity of the acidic group are found to influence the divalent metal ion extraction selectivity and efficiency.
|Number of pages||14|
|Journal||Journal of Inclusion Phenomena and Macrocyclic Chemistry|
|State||Published - Apr 1 2015|
- Calixarene ligands
- Crown compounds
- Ionic recognition
- Metal ion extraction