1. Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
2. Center for Nanosystems Chemistry & Bavarian Polymer Institute, Universität Würzburg, Theodor-Boveri Weg, 97074 Würzburg, Germany
3. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan