1. Department of General and Physical Chemistry, University of Pécs, Pécs, H-7624, Hungary
2. Institute of Chemistry, Karl-Franzens University Graz, Heinrichstr. 28, Graz, A-8010, Austria
3. Institute of Physical and Theoretical Chemistry, Graz University of Technology, Stremayrgasse 9/I, A-8010 Graz, Austria