1. Lomonosov Moscow State University, Department of Chemistry, Leninskie Gory, 119992 Moscow, Russia, Fax: +7‐495‐939‐0998
2. Max‐Planck Institut für Festkörperforschung Heisenbergstr. 1, 70569 Stuttgart, Germany, Fax: +49‐711‐689‐1091
3. École Polytechnique Fédérale de Lausanne (EPFL), Laboratory of Lanthanide Supramolecular Chemistry, BCH 1405, 1015 Lausanne, Switzerland, Fax: +41‐21‐693‐9825
4. Lebedev Physical Institute of Russian Academy of Sciences, Vavilov Luminescence Laboratory, Leninsky Prospect 53, 119991 Moscow, Russia, Fax: +7‐495‐938‐2251