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MA: Fachverband Magnetismus
MA 16: Magnetic characterization techniques
MA 16.8: Vortrag
Dienstag, 13. März 2018, 11:30–11:45, H 0112
Magneto-Structural Study of Dihalo-Bridged Copper Dimers: Intra- and Interdimer Interactions as Revealed by Single-Crystal ESR Spectroscopy — •Dijana Žilić1, Debdeep Maity1, Mario Cetina2, Krešimir Molčanov1, Zoran Džolić1, and Mirta Herak3 — 1R. Bošković Institute, Zagreb, Croatia — 2Faculty of Textile Technology, Zagreb, Croatia — 3Institute of Physics, Zagreb, Croatia
Four complexes with two different oxalamide ligands were synthesized: [CuLA(μ-X)]2 and [CuLV(μ-X)]2, X=Cl or Br. The geometry at each Cu(II) ion is ideal or near ideal square pyramidal, whereas two pyramids share one base-to-apex edge with parallel basal planes. The complexes are linked by hydrogen bonds into infinite chains and are further linked into a 3D network. Magn. susc. measurements show that coppers in the dimers are weakly AFM coupled.
Despite very similar structures of these complexes compared with the complexes previously reported and characterized by similar X-ray, magnetization and powder ESR results, single crystal ESR spectra reveal significant differences. Here presented complexes show unusual anisotropic splitting and merging of ESR lines when their crystals rotate in magn. field. The observation of this partially resolved intradimer dipolar splitting enabled estimation of weak interdimer exchange interaction parameter.[1,2]
[1] Žilić D. et al., Dalton Trans. 2014, 43, 11877.
[2] Žilić D. et al., ChemPhysChem 2017, 18, 2397.
Supported by Croatian Science Foundation HrZZ-UIP-2014-09-9775.