1. Institute
of Chemistry, Saint Petersburg State University, Universitetskaya Nab., 7/9, Saint Petersburg 199034, Russian Federation
2. Department
of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
3. Center
for X-ray Diffraction Studies, Saint Petersburg State University, Universitetskii
Pr., 26, Saint Petersburg 198504, Russian Federation
4. N. S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Pr., 31, Moscow 119991, Russian Federation