1. Institute
of Organic Chemistry and Cenide, University Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
2. Institute
of Inorganic Chemistry, University Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
3. Institute
of Physics, Johannes Gutenberg-University Mainz and Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany