1. Key Laboratory of Organofluorine Chemistry Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 China
2. College of Chemistry Nankai University Tianjin 300071 P. R. China
3. School of Materials and Energy University of Electronic Science and Technology of China 2006 Xiyuan Avenue, West High-Tech Zone Chengdu Sichuan 611731 China