1. 1.
Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring
57, D-70550, Stuttgart, Germany
2. Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
3. Laboratory
of Inorganic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Athens, 157 71 Greece
4. National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States