title: Protonated Hexaazamacrocycles as Selective K(+) Receptors.
abstract: Protonated hexaazamacrocycle [M•H](+) is able to detect K(+) ions present at ppb level in methanolic solutions containing 10(-5) M of Na(+) ions. The high sensitivity and selectivity of [M•H](+) for K(+) is ascribed to the favorable energy balance between the K(+) ion desolvation and its coordination to the [M•H](+) macrocycle, which allows the formation of the corresponding adduct before the Coulombic explosion of the ESI-MS nanodroplets.
authors: Dipartimento di Chimica e Tecnologia del Farmaco, Università La Sapienza, Rome, Italy.
authors: Caterina
authors: C
authors: Fraschetti
authors: Antonello
authors: A
authors: Filippi
authors: Maria Elisa
authors: ME
authors: Crestoni
authors: Enrico
authors: E
authors: Marcantoni
authors: Marco
authors: M
authors: Glucini
authors: Laura
authors: L
authors: Guarcini
authors: Maria
authors: M
authors: Montagna
authors: Leonardo
authors: L
authors: Guidoni
authors: Maurizio
authors: M
authors: Speranza
mesh_terms: D047028:Macrocyclic Compounds / Q000737:chemistry*; D011188:Potassium / Q000737:chemistry*; D011522:Protons; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D047028:Macrocyclic Compounds; D011522:Protons; D011188:Potassium