Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan, Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan, Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo 113-8654, Japan, and CREST, Japan Science and Technology Agency (JST), Japan(2006-06-22時点)
