1. Department of Chemistry, Georgia Southern University, Statesboro, Georgia 30460, United States
2. Department of Chemistry, Taylor University, Upland, Indiana 46989, United States
3. Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
4. Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States
5. Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; Center for Computational Quantum Chemistry, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China