1. Department of Chemistry and Bavarian Polymer Institute, University of Bayreuth, Universitätsstr. 30, Bayreuth 95440, Germany
2. Department of Inorganic Materials, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, Bratislava 812 37, Slovakia
3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava 845 36, Slovakia