1. Departments of Chemistry School of Science, Kitasato University 1-15-1 Kitasato, Sagamihara, Kanagawa 228, Japan Graduate School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan Faculty of Science, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku, Tokyo 152, Japan