1. Contribution from the Department of Chemistry, Kangwon National University, Chunchon 200-701, Republic of Korea, Department of Chemistry, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8551, Japan, and Center for Molecular Design and Synthesis and Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea