Affiliation: | 1. Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo‐ku, Kyoto 606‐8502, Japan, Fax: (+81)?75‐753‐3970;2. Department of Chemistry and Biochemistry, 1 University Station‐A5300, The University of Texas at Austin, Austin, Texas 78712‐0165, USA, Fax: (+1)?512‐471‐7550 |