title: Magnetic differentiation of pyrogallol[4]arene tubular and capsular frameworks.
abstract: The differences in magnetic properties of metal-based nanometric assemblies are due to distinct contributions from host-guest interactions, structural integrity, and magnetic interactions. To disentangle these contributions, it is necessary to control the self-assembly process that forms these entities. Herein we study the effect of host-to-guest ratios to identify remarkably different structural-magnetic contributions of C-methylpyrogallol[4]arene⊂ferrocene/(PgC1)2⊂Fc dimers vs (PgC1)3⊂Fc nanotubes. At low temperature, a weak anti-ferromagnetic alignment is observed, suggesting a weak dipolar interaction between Fc guest moieties within adjacent dimers or tubes. Also, differences are observed between magnetic atom occupancy as a function of guest (PgC1⊂Fc tube/dimer) versus magnetic atom occupancy within the framework wall (PgC3Ni hexamer/dimer). Identification of the role of the framework shape and metal-metal distances in the crystal lattice opens up unparalleled prospects for materials engineering.
authors.affiliation: Department of Chemistry, University of Missouri-Columbia, 601 South College Avenue, Columbia, Missouri 65211, USA.
authors.forename: Harshita
authors.initials: H
authors.lastname: Kumari
authors.forename: Cindi L
authors.initials: CL
authors.lastname: Dennis
authors.forename: Andrew V
authors.initials: AV
authors.lastname: Mossine
authors.forename: Carol A
authors.initials: CA
authors.lastname: Deakyne
authors.forename: Jerry L
authors.initials: JL
authors.lastname: Atwood