1. A. V. Nikolaev Institute of Inorganic Chemistry of the Russian Academy of Sciences, pr. Lavrentyeva 3, 630090 Novosibirsk, Russia
2. University of Jaume I, Experimental Sciences Department, P. O. Box 224, 12080 Castelló, Spain
3. Institute of Inorganic Chemistry, University of Karlsruhe, 76128 Karlsruhe, Germany