1. Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, 917 01 Trnava, Slovakia
2. Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wroclaw, Poland
3. Institute of Inorganic Chemistry, Slovak University of Technology, 812 37 Bratislava, Slovakia
4. Institute of Physics of the Czech Academy of Sciences, 182 21 Prague, Czech Republic