1. Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096, P. R. China, Research Institute for Electronic Science, Hokkaido University, Sapporo, 060-0812, Japan, Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637616, Singapore, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Nanjing University, Nanjing, P. R. China