1. Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education
2. College of Chemistry and Materials Science
3. Northwest University
4. Xi'an 710127
5. P. R. China
6. School of Science
7. MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter
8. Xi'an Jiaotong University
9. Xi'an 710049
10. Institut für Anorganische und Analytische Chemie
11. Westfälische Wilhelms-Universität Münster
12. 48149 Münster
13. Germany