1. Department of Inorganic Chemistry, Taras Shevchenko National University, Volodimirska Street 64, Kyiv 01033, Ukraine, Fax: +38‐044‐239‐33‐06, http://inorganic.chem.univ.kiev.ua/ua/
2. Institute of Organic Chemistry, Murmanska Street 5, Kyiv 02660, Ukraine
3. Faculty of Chemistry, University of Wroclaw, 14 Joliot‐Curie Str., 50‐383 Wroclaw, Poland
4. National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA