title: Studies on the Magnetic Ground State of a Spin Möbius Strip.
abstract: Here we report the synthesis, structure and detailed characterisation of three n-membered oxovanadium rings, Nan [(V=O)n Nan (H2 O)n (α, β, or γ-CD)2 ]⋅m H2 O (n=6, 7, or 8), prepared by the reactions of (V=O)SO4 ⋅x H2 O with α, β, or γ-cyclodextrins (CDs) and NaOH in water. Their alternating heterometallic vanadium/sodium cyclic core structures were sandwiched between two CD moieties such that O-Na-O groups separated the neighbouring vanadyl ions. Antiferromagnetic interactions between the S=1/2 vanadyl ions led to S=0 ground states for the even-membered rings, but to two quasi-degenerate S=1/2 states for the spin-frustrated heptanuclear cluster.
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, 305-8571, Japan.|School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, UK.
authors.forename: Graham N
authors.identifier: http://orcid.org/0000-0003-2246-4466
authors.initials: GN
authors.lastname: Newton
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, 305-8571, Japan.
authors.forename: Norihisa
authors.identifier: http://orcid.org/0000-0002-9841-6375
authors.initials: N
authors.lastname: Hoshino
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, 305-8571, Japan.
authors.forename: Takuto
authors.initials: T
authors.lastname: Matsumoto
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, 305-8571, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Shiga
authors.affiliation: Research Center for Structural Thermodynamics, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka, 560-0043, Japan.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Nakano
authors.affiliation: Institute of Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nojiri
authors.affiliation: CNRS, Institut NEEL, Univ. Grenoble Alpes, 38000, Grenoble, France.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wernsdorfer
authors.affiliation: Ames Laboratory and, Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Furukawa
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, 305-8571, Japan. oshio@chem.tsukuba.ac.jp.
authors.forename: Hiroki
authors.identifier: http://orcid.org/0000-0002-4682-4705
authors.initials: H
authors.lastname: Oshio
keywords: cluster compounds; cyclodextrins; macrocyclic ligands; magnetic properties; vanadium