1. Stratingh Institute for Chemistry University of Groningen Nijenborgh 8 Groningen 9747 AG The Netherlands
2. Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China
3. Department of Chemistry and Nanoscience Center University of Jyväskylä PO Box 35 Jyväskylä 40014 Finland
4. Center for Systems Chemistry Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 Groningen 9747 AG The Netherlands