Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Bio- and Molecular Magnetism
MA 31.5: Vortrag
Freitag, 30. März 2007, 12:00–12:15, H10
Magnetic properties of high-spin tetranuclear Nickel(II) molecular complex — •Christian Golze1, Rüdiger Klingeler1,2, Bernd Büchner1, Vladislav Kataev1, Michel Goiran2, Jean M. Broto2, Harison Rakoto2, and Berthold Kersting3 — 1IFW Dresden, Germany — 2LNCMP Toulouse, France — 3Institute for Anorganic Chemistry Leipzig, Germany
Electron spin resonance and magnetization data of a novel multicenter magnetic molecular complex are reported. In this compound two Ni(II) ions are coupled to a dimer via a diaminthio-bridge and a pair of dimers is coupled in a single molecule via a µ1,3 azide bridge. Thus a single molecule spin cluster of a quadrangular shape comprising four Ni(II) spins each with S = 1 is formed. Magnetization measurements in fields < 52 T evidence a high-spin ground-state with S = 4. ESR has been measured on the polycrystalline sample to determine the zero field splitting of the spin-levels and the g-factor of the resonating spins. Moreover, we have been able to orient the crystallites of the powder in high magnetic fields due to the magnetic anisotropy of the complex. Hence it has been possible to compare experimental quasi single-crystal and powder-averaged ESR data with the theoretical model which yields an accurate determination of the parameters of the spin-Hamiltonian.