1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
2. Institute of Theoretical Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
3. State Key Laboratory of Superhard Materials Jilin University Changchun 130012 P. R. China
4. School of Engineering RMIT University Melbourne 3000 Australia