title: Anion- and Spacer-Directed Host-Guest Complexes of Bipyridine with Pyrogallol[4]arene.
abstract: New oval-shaped capsular and bilayer-type hydrogen-bonded arrangements of C-propyl-ol-pyrogallol[4]arene (PgC3-OH) with bipyridine-type spacer complexes are reported here. These complexes are engineered by virtue of derivatization of C-alkyl tails of pyrogallol[4]arene and the use of divergent spacer ligands. Complexes of PgC3-OH, PgC3-OH with bpy (4,4'-bipyridine) and PgC3-OH with bpa (1,2-bis(4-pyridyl)acetylene) have bilayer type arrangements; however, the use of hydrogen chloride causes protonation of bpy molecule, which is then entrapped flat within an offset oval-shaped dimeric hydrogen-bonded PgC3-OH nanocapsule. The presence of chloride anion in the crystal lattice controls the geometry of the resultant nanoassembly.
authors.affiliation: Department of Chemistry, 601 S. College Avenue, University of Missouri-Columbia, Columbia, MO, 65211 (USA).
authors.forename: Rahul S
authors.initials: RS
authors.lastname: Patil
authors.affiliation: Department of Chemistry, 601 S. College Avenue, University of Missouri-Columbia, Columbia, MO, 65211 (USA).|James L. Winkle College of Pharmacy, 3225 Eden Avenue, University of Cincinnati, Cincinnati, OH, 45267 (USA).
authors.forename: Harshita
authors.initials: H
authors.lastname: Kumari
authors.affiliation: Department of Chemistry, 601 S. College Avenue, University of Missouri-Columbia, Columbia, MO, 65211 (USA).
authors.forename: Charles L
authors.initials: CL
authors.lastname: Barnes
authors.affiliation: Department of Chemistry, 601 S. College Avenue, University of Missouri-Columbia, Columbia, MO, 65211 (USA). atwoodj@missouri.edu.
authors.forename: Jerry L
authors.initials: JL
authors.lastname: Atwood
keywords: calixarenes; hydrogen bonding; nanocapsules; supramolecular chemistry