1. Department of Chemistry, Eszterházy Károly University, Leányka u. 6, H-3300 Eger, Hungary
2. Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary
3. Institute of Chemistry, University of Miskolc, Egyetemváros A/2, H-3515 Miskolc, Hungary