1. CAS Key Laboratory of Engineering Plastics and CAS Research/Education Center for Excellence in Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
2. College of Chemistry; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
3. CAS Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China