1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore560012, India
2. Department of Inorganic Chemistry, Faculty of Science, Palacký University, CZ-771 46Olomouc, Czech Republic
3. N. S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991Moscow, Russia