1. Department of Inorganic Chemistry, Faculty of Science, Universita Karlova (Charles University), Hlavova 2030, 128 43 Prague 2, Czech Republic, Fax: +420‐221951253
2. Centre de Biophysique Moléculaire, UPR 4301, CNRS, rue Charles Sadron, 45071 Orléans, France, Fax: +33‐238631517
3. Regional Centre of Advanced Technologies and Materials, Department of Inorganic Chemistry, Faculty of Science, Palacky University, Tr. 17. Listopadu 12, 77146 Olomouc, Czech Republic