1. Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul 120-749, Korea
2. Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
3. Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station − A5300, Austin, Texas 78712-0165, United States