1. a Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic , Pelleova 24, 160 00 , Prague 6-Dejvice , Czech Republic
2. b Department of Physics , University of Pardubice , Ĉs. Legií 565, 532 10 , Pardubice , Czech Republic
3. c Department of General and Inorganic Chemistry , University of Pardubice , Cs. Legii 565, 532 10 , Pardubice , Czech Republic