title: Tribenzo
abstract: [structure: see text] Dibenzylammonium (DBA+) ions thread through the cavity of tribenzo[27]crown-9 (TB27C9) to generate [2]pseudorotaxanes that are stabilized principally by hydrogen-bonding interactions. The stabilities and complexation kinetics associated with these pseudorotaxanes depend markedly on the nature of the substituents situated on the phenyl rings of the DBA+ ions. For example, the complex formed between TB27C9 and the DBA+ ion bearing electron-withdrawing pCO2Me substituents is stronger than that obtained from TB27C9 and the "parent", unsubstituted DBA+ ion itself. Furthermore, the "parent" complex equilibrates much more rapidly with its uncomplexed components than do the complexes generated from TB27C9 and substituted DBA+ ions.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles 90095-1569, USA.
authors.initials: SJ
authors.lastname: Cantrill
authors.initials: MC
authors.lastname: Fyfe
authors.initials: AM
authors.lastname: Heiss
authors.initials: JF
authors.lastname: Stoddart
authors.initials: AJ
authors.lastname: White
authors.initials: DJ
authors.lastname: Williams