1. G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, 49, Tropinina str., Nizhny Novgorod, 603950 BOX-445, Russia
2. International Tomography Center, 3a Institutskaya Str., Novosibirsk, 630090 Russia
3. Institute of Organoelement compounds of Russian Academy of Sciences, Vavilova str. 28, Moscow, Russia