1. Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
2. University of Chinese Academy of Sciences; Beijing 10049 P. R. China
3. Institute of Applied Chemistry; Jiangxi Academy of Sciences; Nanchang 330096 P. R. China
4. State Key Laboratory for Mechanical Behavior of Materials; Xi'an Jiaotong University; Xi'an 710049 P. R. China
5. College of Chemistry and Environmental Science; Hebei University; Baoding 071002 P. R. China