1. Department of Chemistry, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium, Fax: +32‐3‐820‐23‐10
2. Institute of Organic Chemistry, Russian Academy of Sciences, 630090 Novosibirsk, Russia, Fax: +7‐383‐330‐97‐52
3. Institute of Inorganic Chemistry, Russian Academy of Sciences, 630090 Novosibirsk, Russia
4. Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia