1. Institute for Materials Chemistry and Engineering and International Research Center for Molecular Systems, Kyushu University, Fukuoka 819‐0395 (Japan), Fax: (+81) 92‐802‐2528
2. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611‐0011 (Japan)
3. Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi‐ku, Osaka 558‐6111 (Japan)