1. Max Planck Institute for Polymer Research Ackermannweg 10 Mainz 55128 Germany
2. Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate University 1919‐1 Tancha, Onna‐son Kunigami‐gun Okinawa 904‐0495 Japan
3. Department of Chemistry & Chemical Biology Cornell University Ithaca NY 14853 USA
4. Dipartimento di Chimica “Giacomo Ciamician” Università di Bologna via Selmi 2 Bologna 40126 Italy
5. Department of Chemistry Johannes Gutenberg University Mainz Duesbergweg 10–14 Mainz 55128 Germany