1. Synthetic Chemistry Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
2. Current address: Department of Chemistry University of Oxford Chemistry Research Laboratory Oxford OX1 3TA UK
3. Current address: College of Chemistry and Chemical Engineering Central South University Changsha Hunan 410083 P. R. China
4. Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate University Okinawa 904-0495 Japan
5. Institute of Physical Chemistry Johannes Gutenberg-University Duesbergweg 10–14 55128 Mainz Germany