1. Max-Planck-Institut für Chemie, 55020 Mainz, Germany.
2. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow 119333, Russia.
3. Institute for Nuclear Research, Russian Academy of Sciences, Troitsk, Moscow 142190, Russia.
4. European Synchrotron Radiation Facility, CS40220, F-38043 Grenoble Cedex 9, France.
5. National Research Center “Kurchatov Institute,” 123182 Moscow, Russia.
6. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow 119991, Russia.