1. School of Chemical Engineering
2. Shaanxi Key Laboratory of Degradable Medical Material
3. Northwest University
4. Xi'an 710069
5. P. R. China
6. Department of Chemistry
7. Hong Kong Baptist University
8. Hong Kong
9. Department of Chemistry and Biochemistry
10. The University of Texas at Austin
11. Austin
12. USA
13. MOE Laboratory of Bioinorganic and Synthetic Chemistry/KLGH EI of Environment and Energy Chemistry
14. School of Chemistry and Chemical Engineering
15. Sun Yat-Sen University
16. Guangzhou 510275
17. China