1. Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
2. Institute of Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
3. Faculty of Chemistry and Food Chemistry, Technical University of Dresden, Bergstrasse 66, D-01069 Dresden, Germany
4. Institute of Organic Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
5. Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
6. Department of Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany