Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Bio- and Molecular Magnetism
MA 20.5: Vortrag
Dienstag, 21. März 2017, 10:30–10:45, HSZ 301
Magnetic properties of free transition-metal-benzene complexes — •Christine Bülow1,2, Vicente Zamudio-Bayer1,3, Rebecka Lindblad1,4, Martin Timm1, Akira Terasaki5, Bernd von Issendorff3, and Tobias Lau1 — 1Helmholtz-Zentrum Berlin, Berlin, Germany — 2Technische Universität Berlin, Berlin, Germany — 3Universität Freiburg, Freiburg, Germany — 4Lund University, Lund, Sweden — 5Kyushu University, Fukuoka, Japan
MnBz2+ (Bz = benzene) is a very stable 18 valence electron system. Theory and indirect experimental evidence indicate either the expected fully quenched or a surprising fully atomic-like spin magnetic moment. For CrBz2+, which is one electron short of the closed electronic shell, a magnetic moment of either 1 µB or 5 µB is predicted.
We have investigated the magnetic and electronic properties of MnBzn+ and CrBzn+ (n = 0−2) in the gas phase by x-ray magnetic circular dichroism and x-ray absorption spectroscopy in a cryogenic ion trap.
Our results show that 3d electrons in MnBz and CrBz are localized and therefore these complexes carry a magnetic moment whereas in MnBz2+ and CrBz2+ the 3d electrons are delocalized and the 3d magnetic moment is quenched.