1. Institute of Organic Chemistry, Russian Academy of Sciences, 630090 Novosibirsk, Russia, Department of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium, Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia, and Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia