1. Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
2. Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
3. Organic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
4. State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
5. Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia, 41125 Modena, Italy
6. Istituto Nanoscienze, CNR, via G. Campi 213/a, 41125, Modena, Italy
7. Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
8. Institute of Physical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, D-48149 Münster, Germany