1. Institute of Organic Chemistry & College of Chemical and Materials Science, Shanxi Normal University, Linfen, Shanxi 041004, China
2. College of Chemistry, Chemical Engineering
and Materials Science, Shandong Normal University, Jinan, Shandong 250014, China
3. CAS Key
Laboratory of Microscale Magnetic Resonance, Department of Modern
Physics, University of Science and Technology of China, Hefei 230026, China
4. Key Laboratory of
Magnetic Molecules and Magnetic Information Material, Ministry of Education, Linfen, Shanxi 041004, China