1. Institute of Organic Chemistry of the National Academy of Sciences of Ukraine, Murmans'ka str. 5, 02660 Kyiv, Ukraine, Fax: +380‐44‐573‐2543
2. Fakultät für Chemie der Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
3. Anorganisch‐Chemisches Institut der Universität Bonn, Gerhard‐Domagk‐Str. 1, 5300 Bonn, Germany
4. Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, P. O. Box 55 (A.I. Virtasen aukio 1), 00014 University of Helsinki, Finland
5. Department of Chemistry, University of Jyväskylä, P. O. Box 35, 40114 Jyväskylä, Finland
6. Department of Chemistry, University of California, Riverside, CA 92521‐0403, USA