title: Synthesis, structure and magnetic study of a novel mixed-valent Co(II)10Co(III)4 shield constructed by mixed pyridine-alcoholate ligands.
abstract: A novel tetradecanuclear mixed-valent cobalt cluster, formulated as [Co(II)(10)Co(III)(4)(OH)(2)O(6)(hmp)(10)(pdm)(4)(CH(3)OH)(2)]·5H(2)O (1), was obtained using mixed ligands of 2-(hydroxymethyl)pyridine (hmpH) and 2,6-pyridinedimethanol (pdmH(2)). The cobalt ions in 1 are connected by ten chelating hmp(-) ligands, four tris-chelating pdm(2-) ligands and six μ(3)-oxide/hydroxide anions, forming a unique shield-like planar structure that is rarely observed for Co-based clusters. Compound 1 displays slight frequency dependence at static zero field below 4.5 K, suggesting that it might be a single molecule magnet (SMM).
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Peng
authors.forename: Chong-Bin
authors.initials: CB
authors.lastname: Tian
authors.forename: Hua-Bin
authors.initials: HB
authors.lastname: Zhang
authors.forename: Zhi-Hua
authors.initials: ZH
authors.lastname: Li
authors.forename: Ping
authors.initials: P
authors.lastname: Lin
authors.forename: Shao-Wu
authors.initials: SW
authors.lastname: Du