1. Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems Yonsei University Seoul 03722 Korea
2. Center for Supramolecular Chemistry and Catalysis and Department of Chemistry College of Science Shanghai University Shanghai 200444 P. R. China
3. Department of Physics College of Science Shanghai University 99 Shang-Da Road Shanghai 200444 P. R. China
4. Department of Chemistry The University of Texas at Austin 105 East 24th Street, Stop A5300 Austin TX 78712-1224 USA
5. School of Materials Science and Engineering Shanghai University Shanghai 200444 China