1. Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Shapingba, Chongqing 401331, P. R. China
2. Department of Radio Science and Technology, Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, P. R. China
3. Department of Chemistry, Eastern Kentucky University, Richmond, Kentucky 40475, United States
4. School of Pharmacy, Guizhou Medical University, Guiyang, Guizhou 550000, P. R. China