1. Department of Crystallography , Saint-Petersburg State University , University emb. 7/9 , St. Petersburg 199034 , Russia
2. Kola Science Center, Russian Academy of Sciences , Apatity , Murmansk Region , 184200 , Russia
3. Department of Chemistry , Moscow State University , Vorobievy Gory 1, bd. 3 , Moscow 119991 , Russia