1. Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 18, A-8010 Graz, Austria
2. Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
3. Institute of Organic Chemistry, Graz University of Technology, Stremayrgasse 18, A-8010 Graz, Austria
4. Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 18, A-8010 Graz, Austria