1. Max Planck Institute for Polymer Research Ackermannweg 10 D‐55128 Mainz Germany
2. Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate University 1919‐1 Tancha, Onna‐son, Kunigami Okinawa 904‐0495 Japan
3. Institute of Physical Chemistry Johannes Gutenberg‐University Mainz Duesbergweg 10–14 D‐55128 Mainz Germany