1. Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
2. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China
3. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, P. R. China