1. Department of Chemistry Innovative Drug Research CenterShanghai University Shanghai 200444 P. R. China
2. Laboratory for MicrostructuresInstrumental Analysis and Research Center of Shanghai University Shanghai 200444 P. R. China
3. Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences Shanghai 200032 P. R. China
4. State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences Shanghai 200032 P. R. China