1. Institute of Organic Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany
2. Theoretical Organic Chemistry/Theoretical Chemistry, University of Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany
3. Institut für Anorganische und Analytische Chemie and Center for Nanotechnology, Westfälische Wilhelms-Universität Münster, Heisenbergstr. 11, 48149 Münster, Germany
4. Institute of Inorganic Chemistry, University of Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany
5. Institute of Organic Chemistry, Corrensstr. 40, 48149 Münster, Germany