title: Construction of a novel topological frustrated system: a frustrated metal cluster in a helical space.
abstract: A novel topologically frustrated pentanuclear cluster helicate [{Cu(II)(μ-L)(3)}(2)Cu(II) (3)(μ(3)-OH)](3+) (L(-)=3,5-bis(2-pyridyl)pyrazolate) has been synthesized and characterized. This cluster has a helical arrangement of ligands around the central metal core. Dzyaloshinsky-Moriya interactions are essential components to observe a gradual magnetization and forbidden transitions of high-field/multi-frequency (HF/MF)-ESR. The origin of the magnetic anisotropy of this compound is influenced by its helical spin structure, and consequently, the Cu(5)-cluster helicate introduces a unique magnetic anisotropy. This observation is a direct evidence of the topological part of the new spin phase in a magnetic system.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Ryuta
authors.initials: R
authors.lastname: Ishikawa
authors.forename: Motohiro
authors.initials: M
authors.lastname: Nakano
authors.forename: Akira
authors.initials: A
authors.lastname: Fuyuhiro
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Takeuchi
authors.forename: Shojiro
authors.initials: S
authors.lastname: Kimura
authors.forename: Takanari
authors.initials: T
authors.lastname: Kashiwagi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hagiwara
authors.forename: Koichi
authors.initials: K
authors.lastname: Kindo
authors.forename: Sumio
authors.initials: S
authors.lastname: Kaizaki
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kawata
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D008670:Metals / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*
chemical_list: D008024:Ligands; D008670:Metals; D009942:Organometallic Compounds; D003300:Copper