title: High affinity of water-soluble cryptophanes for cesium cations.
abstract: Exceptionally high affinity for cesium cations was achieved in aqueous solution using two enantiopure cryptophanes. Complexation of cesium was evidenced by (133)Cs NMR spectroscopy and by electronic circular dichroism (ECD). Binding constants as high as 6 × 10(9) M(-1) have been measured by isothermal titration calorimetry (ITC). Very strong complexation of rubidium cations (K ~10(6) M(-1)) has also been measured. Chiral hosts allowed the detection of the two cations at low concentrations (μM) using ECD.
authors.affiliation: Laboratoire de Chimie de l'ENS-LYON (UMR 5182-CNRS), Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon 07, France. thierry.brotin@ens-lyon.fr
authors.forename: Thierry
authors.initials: T
authors.lastname: Brotin
authors.forename: Roland
authors.initials: R
authors.lastname: Montserret
authors.forename: Aude
authors.initials: A
authors.lastname: Bouchet
authors.forename: Dominique
authors.initials: D
authors.lastname: Cavagnat
authors.forename: Mathieu
authors.initials: M
authors.lastname: Linares
authors.forename: Thierry
authors.initials: T
authors.lastname: Buffeteau
mesh_terms: D002151:Calorimetry / Q000379:methods; D002412:Cations; D002586:Cesium / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002942:Circular Dichroism; D009682:Magnetic Resonance Spectroscopy; D011083:Polycyclic Compounds / Q000737:chemistry* / Q000378:metabolism; D012413:Rubidium; D012995:Solubility; D012996:Solutions; D014867:Water
chemical_list: D002412:Cations; D011083:Polycyclic Compounds; D012996:Solutions; C523242:cryptophane; D014867:Water; D002586:Cesium; D012413:Rubidium