title: Resorcinarenes are hexameric capsules in solution.
abstract: The host-guest complexes of resorcin[4]arenes with small molecules in organic solutions are examined using modern NMR spectroscopic methods. The complexation of glutaric acid and beta-methyl d-glucopyranoside in chloroform were investigated through 2D COSY, 2D NOESY, 1D NOE, and diffusion-ordered NMR spectroscopy (DOSY) techniques. These methods indicate that the complex is a self-assembled capsule composed of six resorcinarenes that surround six guest molecules of glutaric acid or three molecules of beta-methyl d-glucopyranoside inside. The multiplicity of guest proton signals shows that the capsule provides an asymmetric magnetic environment that persists on the (1)H NMR time scale. The encapsulation of these guests and common solvents suggests that the phenomenon of reversible encapsulation in chemistry may be a century old.
authors.affiliation: The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
authors.forename: Tamar
authors.initials: T
authors.lastname: Evan-Salem
authors.forename: Inbal
authors.initials: I
authors.lastname: Baruch
authors.forename: Liat
authors.initials: L
authors.lastname: Avram
authors.forename: Yoram
authors.initials: Y
authors.lastname: Cohen
authors.forename: Liam C
authors.initials: LC
authors.lastname: Palmer
authors.forename: Julius
authors.initials: J
authors.lastname: Rebek
mesh_terms: D047250:Calixarenes / Q000737:chemistry; D005977:Glutarates / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010649:Phenylalanine / Q000031:analogs & derivatives* / Q000737:chemistry; D012997:Solvents / Q000737:chemistry
chemical_list: D005977:Glutarates; D012997:Solvents; C466160:resorcinarene; D047250:Calixarenes; D010649:Phenylalanine; C035736:glutaric acid