1. Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, S1-6, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552, Japan
2. Department of Chemical Science and Technology, Faculty of Bioscience and Applied Chemistry, Hosei University, 3-7-2, Kajino-chou, Koganei, Tokyo 184-8584, Japan
3. Makromolekulare Chemie II, Universität Bayreuth, D-95440 Bayreuth, Germany