1. Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany
2. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84536 Bratislava, Slovakia
3. Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina, SK-84215 Bratislava, Slovakia
4. Department of Physics, University of Patras, GR-26504 Patras, Greece
5. Department of Optics and Optometry, Technological Educational Institute of Patras, GR-25100 Aigio, Greece