1. School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, Jiangxi, P. R. China
2. SDU-ANU Joint Science College, Shandong University, Weihai 264209, P. R. China
3. Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore 117544, Republic of Singapore
4. Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry Chinese Academy of Sciences, Shanghai 200032, P. R. China