1. Institute of Inorganic Chemistry, University of Vienna, Währinger Strasse 42,
A-1090 Vienna, Austria
2. Department of Inorganic and
Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
3. HAS-USZ Bioinorganic Chemistry Research Group, Dóm tér 7, H-6720
Szeged, Hungary
4. Laboratoire National des Champs Magnétiques Intenses-CNRS, 25 Avenue
des Martyrs, F-38042 Grenoble Cedex 9, France