Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Bio- and Molecular Magnetism
MA 14.4: Vortrag
Dienstag, 1. April 2014, 10:15–10:30, HSZ 401
Magnetization studies of Cu-(bis) oxamato complexes with ferrocenium ligand — •Azar Aliabadi1, Andreas Petr1, Mohammad A. Abdulmalic2, Tobias Rüffer2, Vladislav Kataev1, and Bernd Büchner1 — 1IFW Dresden, Dresden, Germany — 2Institute of Chemistry, Chemnitz University of Technology, Chemnitz, Germany
Magnetic properties of Cu-(bis) oxamato complexes with ferrocenium ligand ([nBu4N]2[Cu(1,1′-fcba)] (1) and [Cu3(1,1′-fcba)(pmdta)2](NO3)3 (2)) were studied by static magnetic susceptibility and ESR spectroscopy.
For 1 a weak antiferromagnetic coupling between the Cu(II) and Fe(III) ions has been obtained. For 2 an antiferromagnetic coupling of -64 cm−1 ions and a weak ferromagnetic coupling between the central Cu(II) ion and the Fe(III) ion have been found.
The ESR spectrum of 1 at f = 9.56 GHz and at 4K is a superposition of a signal from Cu(II) and of additional signals which can be attributed to a ferrocenium cation. The shape and the position of the peaks clearly demonstrate two different phases of ferrocenium.
The ESR spectrum of 2 at 4K consists of a single line at a field of 0.32 T which can be assigned to a joint resonance response of three Cu(II) ions and one Fe(III) ion. The calculated isotropic g-factor 2.11 is typical to a g-factor of Cu(II) and also indicates a strong distortion of the axial symmetry in ferrocenium cation.
We discuss possible correlations between the structure of the complexes and their magnetic properties.