1. Key Laboratory of Magnetic Molecules & Magnetic Information Materials, Ministry of Education, School of Chemistry & Material Science, Shanxi Normal University, 1 Gongyuan Street, Linfen, Shanxi 041004, P. R. China
2. Department of Pharmacy, Changzhi Medical College, 161 East Jiefang Street, 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, 79 Yingze West, Taiyuan, Shanxi 030024, P. R. China