1. Key Laboratory of Polyoxometalate Science of the Ministry of Education
2. Faculty of Chemistry
3. Northeast Normal University
4. Changchun
5. P. R. China
6. School of Material Science and Engineering
7. Beijing Institute of Technology
8. Beijing 100081
9. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
10. College of Chemistry
11. Jilin University
12. Changchun 130012