title: Bistren cryptands and cryptates: versatile receptors for anion inclusion and recognition in water.
abstract: Bistren cryptands can be easily synthesised through the Schiff base condensation of two molecules of tren and three molecules of a dialdehyde, followed by hydrogenation of the six C=N double bonds to give octamine cages, whose ellipsoidal cavity can be varied at will, by choosing the appropriate dialdehyde, in order to include substrates of varying sizes and shapes. Bistrens can operate as effective anion receptors in two ways: (i) in their protonated form, providing six secondary ammonium groups capable of establishing hydrogen bonding interactions with the anion; (ii) as dicopper(II) cryptates, in which the two coordinatively unsaturated metal centres can be bridged by an ambidentate anion. Representative examples of the two approaches, as well as the design of an anion molecular dispenser, in which a dicopper(II) bistren cryptate acts as a bottle will be illustrated.
authors: Dipartimento di Scienze Chimiche, Università di Messina, Viale F. Stagno d'Alcontres 31, Villaggio S. Agata, 98166 Messina, Italy.
authors: Giuseppe
authors: G
authors: Alibrandi
authors: Valeria
authors: V
authors: Amendola
authors: Greta
authors: G
authors: Bergamaschi
authors: Luigi
authors: L
authors: Fabbrizzi
authors: Maurizio
authors: M
authors: Licchelli
mesh_terms: D000838:Anions; D002712:Chlorides / Q000737:chemistry; D043844:Crown Ethers / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D006863:Hydrogen-Ion Concentration; D066244:Proton Magnetic Resonance Spectroscopy; D011522:Protons; D012492:Salts / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry; D012996:Solutions; D013057:Spectrum Analysis; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
chemical_list: D000838:Anions; D002712:Chlorides; D043844:Crown Ethers; D011522:Protons; D012492:Salts; D012545:Schiff Bases; D012996:Solutions; D014867:Water