1. Institute of Organic Chemistry, Russian Academy of Sciences, 630090 Novosibirsk, Russia, Fax: +7.383.330.97.52
2. Institute of Inorganic Chemistry, Russian Academy of Sciences 630090 Novosibirsk, Russia
3. Department of Chemistry, University of Antwerp, Universiteitsplein 1, B‐2610 Wilrijk, Belgium, Fax: +32.3.820.23.10
4. Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia