1. State Key Laboratory of Applied Organic Chemistry, Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China
2. Key Laboratory for New Molecule Materials Design and Function of Gansu Universities, College of Chemical Engineering and Technology, Tianshui Normal University, Tianshui 741001, PR China
3. School of Physics, Xidian University, Xi'an 710071, PR China