A novel ditopic receptor and reversal of anion binding selectivity in the presence and absence of bound cation.
A calix[4]arene-derived ditopic receptor 1 has been synthesized. In the absence of Na+, the receptor binds acetate in preference to diphenyl phosphate (as the tetrabutylammonium salts), but in the presence of Na+, the selectivity is reversed and the receptor, instead, binds diphenyl phosphate, and not acetate, which preferentially forms a salt ion-pair in free solution. [structure: see text]
Tumcharern
Gamolwan
G
Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Tuntulani
Thawatchai
T
Coles
Simon J
SJ
Hursthouse
Michael B
MB
Kilburn
Jeremy D
JD
D000085:Acetates / Q000737:chemistry; D047250:Calixarenes; D002412:Cations / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D010710:Phosphates; D012964:Sodium / Q000737:chemistry
D000085:Acetates; D002412:Cations; D010636:Phenols; D010710:Phosphates; C121325:calix(4)arene; D047250:Calixarenes; D012964:Sodium