1. Key Laboratory of Molecular
Nanostructure and Nanotechnology and Beijing National Laboratory for
Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, P. R. China
2. University of CAS, Beijing 100049, P. R. China
3. State Key Laboratory of Applied
Organic Chemistry, Lanzhou University,
Lanzhou, Gansu 730000, P. R. China