1. Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8656, Japan; Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Naka-cho 2-24-16, Koganei-shi, Tokyo 184-8588, Japan; and Materials Science and Analysis Research Center, Corporate Research Laboratories, Mitsubishi Rayon Co. Ltd., 20-1 Miyuki-cho, Ohtake, Hiroshima 739-0693, Japan