1590418-66-8Relevant articles and documents
Acetato-bridged dinuclear lanthanide complexes with single molecule magnet behaviour for the Dy2 species
Zhang, Haixia,Lin, Shuang-Yan,Xue, Shufang,Wang, Chao,Tang, Jinkui
, p. 6262 - 6268 (2014)
Five dinuclear lanthanide complexes with formula [Ln2L 2(OAc)4(MeOH)a(H2O) b]·cMeOH·dH2O (a = 2, b = 0, c = 2, d = 0, Ln = Sm (1), Gd (2), Dy (3); a = 0, b = 2, c = 4, d = 2, Ln = Tm (4)) and [Yb2L2(OAc)4(MeOH)2]·[Yb 2L2(OAc)4(H2O)2] ·2H2O (5) (HL = (E)-N′-(2-hydroxybenzylidene)-2- mercaptonicotinohydrazide), have been synthesized and their crystal structures and magnetic properties are reported. All five complexes are centrosymmetric, showing a similar dinuclear core with two lanthanide ions in each complex being bridged by acetate groups in the η1:η2: μ2 mode. The various coordination modes of acetate groups result in two kinds of coordination geometries for Ln ions with the ones in complexes 1-4 and the Yb2 in 5 being nine-coordinated with a mono-capped square antiprism geometry, while the Yb1 ions in the other part of complex 5 are eight-coordinated with a triangular dodecahedron geometry. Magnetic susceptibility studies reveal that complex 3 shows single molecule magnet behaviour with an energy barrier of 39.1 K. In addition, comparison of the structural parameters among the similar Dy2 SMMs with a η1:η2:μ2 coordination mode of carboxylate groups reveals the significant role played by coordination geometry in modulating the relaxation dynamics of SMMs. This journal is the Partner Organisations 2014.
