Institution: | 1. Department of Chemistry , The University of Tokyo, Hongo, Bunkyo‐ku, Tokyo 113‐0033 (Japan), Fax: (+81)?3‐5800‐6889;2. Present address: Department of Chemistry, Tohoku University, Aoba‐ku, Sendai 980‐8578 (Japan);3. Exploratory Research for Advanced Technology (ERATO), Nakamura Functional Carbon Cluster Project, Japan Science and Technology Agency (JST), Hongo, Bunkyo‐ku, Tokyo 113‐0033 (Japan) |