title: A new cryptand: synthesis and complexation with paraquat.
abstract: [formula: see text] Inspired by folded, nonpseudorotaxane complexes of bis(m-phenylene)-32-crown-10 systems, we synthesized a new bicyclic crown ether containing two 1,3,5-phenylene units linked by three tetra(ethyleneoxy) units. The new cryptand forms a "pseudorotaxane-like" inclusion complex with N,N'-dimethyl-4,4'-bipyridinium bis(hexafluorophosphate) with association constant Ka = 6.1 x 10(4) M-1, 100-fold greater than that of an analogous simple crown ether.
authors.affiliation: Department of Chemistry, Virginia Polytechnic Institute & State University, Blacksburg 24061, USA.
authors.forename: W S
authors.initials: WS
authors.lastname: Bryant
authors.forename: J W
authors.initials: JW
authors.lastname: Jones
authors.forename: P E
authors.initials: PE
authors.lastname: Mason
authors.forename: I
authors.initials: I
authors.lastname: Guzei
authors.forename: A L
authors.initials: AL
authors.lastname: Rheingold
authors.forename: F R
authors.initials: FR
authors.lastname: Fronczek
authors.forename: D S
authors.initials: DS
authors.lastname: Nagvekar
authors.forename: H W
authors.initials: HW
authors.lastname: Gibson
mesh_terms: D004988:Ethers, Cyclic / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010269:Paraquat / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D014961:X-Ray Diffraction
chemical_list: D004988:Ethers, Cyclic; D010269:Paraquat