title: Calix[4]tetrahydrothiophenopyrrole: a ditopic receptor displaying a split personality for ion recognition.
abstract: A calix[4]pyrrole fused with 2,5-dihydrothiophene, possessing both a deep, π-electron-rich pocket upon anion binding and chelating ligands on the periphery, was developed. The receptor selectively forms an ion-pair complex with CsF through H-bonding and a cation-π interaction. In the process, it adopt a conformationally fixed cone conformation. The receptor displays exceptionally high affinity toward the Hg(II) ion and forms stable complexes while maintaining a rigid 1,3-alternate conformation. This metal ion-induced conformational locking is unprecedented in calix[4]pyrrole chemistry.
authors.affiliation: Department of Chemistry, Kangwon National University , Chun Cheon 200-701, Korea.
authors.forename: Indrajit
authors.initials: I
authors.lastname: Saha
authors.forename: Kyung Hwa
authors.initials: KH
authors.lastname: Park
authors.forename: Mina
authors.initials: M
authors.lastname: Han
authors.forename: Sung Kuk
authors.initials: SK
authors.lastname: Kim
authors.forename: Vincent M
authors.initials: VM
authors.lastname: Lynch
authors.forename: Jonathan L
authors.initials: JL
authors.lastname: Sessler
authors.forename: Chang-Hee
authors.initials: CH
authors.lastname: Lee