Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.152: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
EPR and magnetic susceptibility investigations on Cu(II)-bis(oxamato) complexes — •Björn Bräuer1, Tobias Rüffer1, Dietrich Zahn1, Georgeta Salvan1, Dante Gatteschi2, Andrea Caneschi2, Maria Fittipaldi2, and Federico Totti2 — 1Chemnitz University of Technology, Faculty of Natural Sciences, Reichenhainer Straße 70, 09126 Chemnitz, Germany — 2University of Florence, Department of Chemistry, Via della Lastruccia 3, 50019 Florence, Italy
Cu(II)-bis(oxamato) complexes are prominent representatives for basic research studies of magnetic exchange phenomena with square planar coordination geometry [1]. In order to study the influence of the deviations from square planar coordination geometry on the spin density determined by electron paramagnetic resonance (EPR), we have synthesized a ligand with a N2O2 donor set providing distortion from a square planar geometry due to steric reasons. The magnetic coupling constant J of tri-nuclear Cu(II)-bis(oxamato) complexes was determined from magnetic susceptibility measurements using superconducting quantum interference device (SQUID) magnetometer. The superexchange interactions between the Cu(II) ions were found to be antiferromagnetic and to vary significantly with the coordination geometry. The trends were reinforced by density functional theory (DFT) studies. [1] O. Kahn, Molecular Magnetism, VCH Weinheim, 1993.