1. Key Laboratory of Magnetic Molecules & Magnetic Information Materials, Ministry of Education, School of Chemistry & Material Science, Shanxi Normal University, Taiyuan, 030006, P. R. China
2. Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA, 90095, USA
3. Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, 330022, P. R. China
4. School of Chemistry, Taiyuan University of Technology, Taiyuan, 030024, P. R. China