1. Laboratory of Molecular Recognition and Synthesis
2. Department of Chemistry
3. Zhejiang University
4. Hangzhou 310027
5. P. R. China
6. Shanghai Key Laboratory of Magnetic Resonance
7. Department of Physics
8. East China Normal University
9. Shanghai 200062
10. State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry
11. Chinese Academy of Sciences
12. Shanghai 200032