1. Institute of Atomic and Molecular Physics, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun 130012, P. R. China
2. Beijing National Laboratory for Molecular Sciences, Beijing 100190, P. R. China
3. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, United States
4. A School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P. R. China
5. Chemistry Department and Institute of Soft Matter, Georgetown University, Washington, D.C. 20057-1227, United States