1. Institute of Chemistry
2. Saint Petersburg State University
3. Saint Petersburg 199034
4. Russian Federation
5. Department of Chemistry
6. University of the Free State
7. Bloemfontein 9300
8. South Africa
9. Center for X-ray Diffraction Studies
10. Saint Petersburg 198504
11. N. S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
12. Moscow 119991