title: Magnetic properties of dysprosium cubanes dictated by the M-O-M angles of the [Dy4(mu3-OH)4] core.
abstract: Two new dysprosium(III) coordination compounds, namely, [Dy(4)(HL)(4)(C(6)H(4)NH(2)COO)(2)(mu(3)-OH)(4)(mu-OH)(2)(H(2)O)(4)].4CH(3)CN.12H(2)O (1) and Dy(8)(HL)(10)(C(6)H(4)NH(2)COO)(2)(mu(3)-OH)(8)(OH)(2)(NO(3))(2)(H(2)O)(4)] (2), have been synthesized from the Schiff-base ligand 2-{[(2-hydroxy-3-methoxyphenyl)methylidene]amino}benzoic acid (H(2)L) and dysprosium chloride (1) or dysprosium nitrate (2). Single-crystal X-ray diffraction studies reveal that compound 1 exhibits a tetranuclear cubane-like structure and that 2 is an octanuclear, bis-cubane complex. The [Dy(4)(mu (3)-OH)(4)] cubane cores of 1 and 2 are structurally related; however, the magnetic properties of 1 and 2 are drastically different. Indeed, 2 shows slow relaxation of magnetization while no out-of-phase alternating current (ac) signal is noticed for 1. These significant disparities are most likely due to the different M-O-M angles observed for the respective cubane cores.
authors.affiliation: Contribution from State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P.R. China.
authors.forename: Hongshan
authors.initials: H
authors.lastname: Ke
authors.forename: Patrick
authors.initials: P
authors.lastname: Gamez
authors.forename: Lang
authors.initials: L
authors.lastname: Zhao
authors.forename: Gong-Feng
authors.initials: GF
authors.lastname: Xu
authors.forename: Shufang
authors.initials: S
authors.lastname: Xue
authors.forename: Jinkui
authors.initials: J
authors.lastname: Tang