1. Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo‐ku, Kyoto 606‐8502 (Japan), Fax: (+81) 75‐753‐3970
2. Spectroscopy Laboratory for Functional π‐electronic Systems, Department of Chemistry, Yonsei University, Seoul 120‐749 (Korea), Fax: (+82) 2‐2123‐2434