1. College of Chemistry, Chemical Engineering
and Materials Science, Soochow University, Jiangsu 215123, P. R. China
2. College of Chemistry, Tianjin Normal University, Tianjin 300387, P. R. China
3. Institut für Chemie und Biochemie, Freie Universität Berlin, D-14195 Berlin, Germany
4. Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30677, United States
5. Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706-1322, United States