Affiliation: | 1. Department of Chemistry, Kangwon National University, Chun‐Chon 200‐701 (Korea), Fax: (+82)?33‐250‐8490;2. Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin TX 78712 (USA);3. Department of Chemistry, Yonsei University, Seoul 120‐749 (Korea) |