1. Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan, Department of Material Science, Faculty of Science, Himeji Institute of Technology, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyougo 678-1297, Japan, and Department of Material Science, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan