1. School
of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory
of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, 221116 Jiangsu P. R. China; and
2. Institute
of Chemistry and Biomedical Sciences, Nanjing University, Nanjing 210093, P. R. China; and
3. Department
of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States