1. Department of Chemistry, Graduate School of Science The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan Department of Chemistry, Faculty of Science Tokyo Metropolitan University Minami-osawa, Hachioji, Tokyo 192-03, Japan Department of Chemistry, Faculty of Science Tokyo Institute of Technology 2-12-1 O-okayama, Meguro-ku, Tokyo 152, Japan