title: Planar tetranuclear Dy(III) single-molecule magnet and its Sm(III), Gd(III), and Tb(III) analogues encapsulated by salen-type and β-diketonate ligands.
abstract: The syntheses, structures, and magnetic properties are reported for four new lanthanide clusters [Sm(4)(μ(3)-OH)(2)L(2)(acac)(6)]·4H(2)O (1), [Gd(4)(μ(3)-OH)(2)L(2)(acac)(6)]·4CH(3)CN (2), and [Ln(4)(μ(3)-OH)(2)L(2)(acac)(6)]·2H(2)L·2CH(3)CN (3, Ln = Tb; 4, Ln = Dy) supported by salen-type (H(2)L = N,N'-bis(salicylidene)-1,2-cyclohexanediamine) and β-diketonate (acac = acetylacetonate) ligands. The four clusters were confirmed to be essentially isomorphous by infrared spectroscopy and single-crystal X-ray diffraction. Their crystal structures reveal that the salen-type ligand provides a suitable tetradentate coordination pocket (N(2)O(2)) to encapsulate lanthanide(III) ions. Moreover, the planar Ln(4) core is bridged by two μ(3)-hydroxide, four phenoxide, and two ketonate oxygen atoms. Magnetic properties of all four compounds have been investigated using dc and ac susceptibility measurements. For 4, the static and dynamic data indicate that the Dy(4) complex exhibits slow relaxation of the magnetization below 5 K associated with single-molecule magnet behavior.
authors: Key Laboratory of Functional Inorganic Material Chemistry, Heilongjiang University, Ministry of Education, No. 74, Xuefu Road, Nangang District, Harbin 150080, PR China.
authors: Peng-Fei
authors: PF
authors: Yan
authors: Po-Heng
authors: PH
authors: Lin
authors: Fatemah
authors: F
authors: Habib
authors: Tomoko
authors: T
authors: Aharen
authors: Muralee
authors: M
authors: Murugesu
authors: Zhao-Peng
authors: ZP
authors: Deng
authors: Guang-Ming
authors: GM
authors: Li
authors: Wen-Bin
authors: WB
authors: Sun