title: A Halogen-Bond-Induced Triple Helicate Encapsulates Iodide.
abstract: The self-assembly of higher-order anion helicates in solution remains an elusive goal. Herein, we present the first triple helicate to encapsulate iodide in organic and aqueous media as well as the solid state. The triple helicate self-assembles from three tricationic arylethynyl strands and resembles a tubular anion channel lined with nine halogen bond donors. Eight strong iodine⋅⋅⋅iodide halogen bonds and numerous buried π-surfaces endow the triplex with remarkable stability, even at elevated temperatures. We suggest that the natural rise of a single-strand helix renders its linear halogen-bond donors non-convergent. Thus, the stringent linearity of halogen bonding is a powerful tool for the synthesis of multi-strand anion helicates.
authors.affiliation: Department of Chemistry and Biochemistry, University of Montana, 32 Campus Dr, Missoula, MT, 59812, USA.
authors.forename: Casey J
authors.initials: CJ
authors.lastname: Massena
authors.affiliation: Department of Chemistry and Biochemistry, University of Montana, 32 Campus Dr, Missoula, MT, 59812, USA.
authors.forename: Nicholas B
authors.initials: NB
authors.lastname: Wageling
authors.affiliation: Department of Chemistry and Biochemistry, University of Montana, 32 Campus Dr, Missoula, MT, 59812, USA.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Decato
authors.affiliation: Department of Chemistry and Biochemistry, University of Montana, 32 Campus Dr, Missoula, MT, 59812, USA.
authors.forename: Enrique
authors.initials: E
authors.lastname: Martin Rodriguez
authors.affiliation: Department of Chemistry and Biochemistry, University of Montana, 32 Campus Dr, Missoula, MT, 59812, USA.
authors.forename: Ariana M
authors.initials: AM
authors.lastname: Rose
authors.affiliation: Department of Chemistry and Biochemistry, University of Montana, 32 Campus Dr, Missoula, MT, 59812, USA. orion.berryman@umontana.edu.
authors.forename: Orion B
authors.identifier: 0000-0002-0324-484X
authors.initials: OB
authors.lastname: Berryman
mesh_terms: D000631:Aminopyridines / Q000737:chemistry; D006219:Halogens / Q000737:chemistry*; D007454:Iodides / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular
chemical_list: D000631:Aminopyridines; D006219:Halogens; D007454:Iodides; D046911:Macromolecular Substances
keywords: halogen bonding; helical structures; host-guest systems; self-assembly; supramolecular chemistry