* Corresponding authors

^a Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Photochemistry, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
E-mail: zxluo@iccas.ac.cn, jnyao@iccas.ac.cn
Fax: +86 10 62553453
Tel: +86 10 62553453

^b Key Laboratory of Functional Small Organic Molecule, Ministry of Education, and Jiangxi's Key Laboratory of Green Chemistry, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China