1. Key Laboratory of Magnetic Molecules and Magnetic Information Material of Ministry of Education, School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, Shanxi, 030006, P. R China
2. Department of Pharmacy, Changzhi Medical College, Changzhi, Shanxi, 046000, P. R. China
3. College of Chemistry & Chemical Engineering, Key Laboratory of Interface Science and Engineering in Advanced Material, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China