1. Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Liutiao Road #2, Changchun 130061, P. R. China
2. School of Physics, Northeast Normal University, Changchun 130024, P. R. China
3. State Key Laboratory of Rare Earth Resource Utililzation, Changchun, Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China