1. Department
of Chemistry and Pharmacy, Friedrich-Alexander University of Erlangen-Nürnberg, Institute of Organic Chemistry, Henkestrasse 42, 91054 Erlangen, Germany
2. Joint
Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander University of Erlangen-Nürnberg, Dr.-Mack Strasse 81, 90762 Fürth, Germany
3. Faculty
of Physics, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria