1. Department of Chemistry, Kiev National Taras Shevchenko University, 64 Volodymyrska
Street, 01601 Kiev, Ukraine
2. Institute of Inorganic
Chemistry, Georg-August-University Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
3. Department of Chemistry, University of Joensuu, P.O. Box 111,
80101 Joensuu, Finland
4. Institute of Inorganic
Chemistry, Ruprecht-Karls-University Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
5. Department of Physics, University of Erlangen-Nürnberg, Erwin-Rommel-Strasse 1, D-91058 Erlangen, Germany