1. Materials Chemistry Laboratory School of Molecular Science-BK21 Korea Advanced Institute of Science and Technology Taejon, 305-701, Korea Department of Chemistry, Kent State University Kent, Ohio 44242 CREST, JST, Tohoku University Sendai 980-8578, Japan Institute for Materials Research, Tohoku University Sendai 980-8578, Japan Department of Physics and CREST, JST Tohoku University, Sendai 980-8578, Japan