1. Max-Planck Institut
für Chemische Energiekonversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany
2. Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstr.
4, D-37077 Göttingen, Germany
3. Department
of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43 Praha 2, Czech Republic
4. Institute
of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria