TY - JOUR
T1 - New 5,17-(di-ionizable)-25,26,27,28-tetraalkoxycalix[4]arene ligands
T2 - Synthesis and selected divalent metal ion extractions
AU - Son, Pillhun
AU - Arora, Gaurav
AU - Crawford, Jennifer D.
AU - Lee, Eun Kyung
AU - Hope-Weeks, Louisa J.
AU - Surowiec, Kazimierz
AU - Bartsch, Richard A.
N1 - Publisher Copyright:
© 2015 Springer Science+Business Media Dordrecht.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - 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.
AB - 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.
KW - Calix[4]arene ligands
KW - Crown compounds
KW - Ionic recognition
KW - Metal ion extraction
UR - http://www.scopus.com/inward/record.url?scp=84957066270&partnerID=8YFLogxK
U2 - 10.1007/s10847-015-0474-2
DO - 10.1007/s10847-015-0474-2
M3 - Article
AN - SCOPUS:84957066270
SN - 0923-0750
VL - 81
SP - 451
EP - 464
JO - Journal of Inclusion Phenomena and Macrocyclic Chemistry
JF - Journal of Inclusion Phenomena and Macrocyclic Chemistry
IS - 3-4
ER -