title: Tetranuclear Lanthanide Complexes Containing a Hydrazone-type Ligand. Dysprosium [2 × 2] Gridlike Single-Molecule Magnet and Toroic.
abstract: A multidentate hydrazone-type ligand (Z,Z)-bis(1-(pyridin-2-yl)-1-amino-methylidene)oxalohydrazide (H2L) was utilized in the synthesis of three new isomorphous tetranuclear complexes of the general formula [Ln4(HL)4(H2L)2(NO3)4](NO3)4·4CH3OH (Ln = GdIII, 1, TbIII, 2, DyIII, 3) with the gridlike [2 × 2] topology. The analysis of the static magnetic data revealed weak anti-ferromagnetic interaction among lanthanide(III) atoms, whereas dynamic magnetic data led to the observation of the single-molecule magnet behavior in zero static magnetic field for the Dy4compound 3 with Ueff= 42.6 K and τ0= 1.50 × 10-5s. The theoretical CASSCF calculations supported also the presence of the net toroidal magnetic moment, which classifies compound 3 also as a single-molecule toroic.
authors.affiliation: General and Physical Chemistry Department, Crimean Federal University , Simferopol, Crimea.
authors.forename: Alexey
authors.initials: A
authors.lastname: Gusev
authors.affiliation: Department of Inorganic Chemistry, RCPTM, Faculty of Science, Palacký University , Olomouc, Czech Republic.
authors.forename: Radovan
authors.initials: R
authors.lastname: Herchel
authors.affiliation: Department of Inorganic Chemistry, RCPTM, Faculty of Science, Palacký University , Olomouc, Czech Republic.
authors.forename: Ivan
authors.initials: I
authors.lastname: Nemec
authors.affiliation: General and Physical Chemistry Department, Crimean Federal University , Simferopol, Crimea.
authors.forename: Victor
authors.initials: V
authors.lastname: Shul'gin
authors.forename: Igor L
authors.initials: IL
authors.lastname: Eremenko
authors.forename: Kostantin
authors.initials: K
authors.lastname: Lyssenko
authors.affiliation: Institute of Applied Synthetic Chemistry, Vienna University of Technology , Vienna, Austria.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Linert
authors.affiliation: Department of Inorganic Chemistry, RCPTM, Faculty of Science, Palacký University , Olomouc, Czech Republic.
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Trávníček