About the Authors

Guihong Wang

Affiliation College of Chemistry, Beijing Normal University, Beijing, People’s Republic China

Chaoqun Li

Affiliation College of Chemistry, Beijing Normal University, Beijing, People’s Republic China

Yan Wang

wangy@bnu.edu.cn (YW); gjchen@bnu.edu.cn (GC)

Current address: College of Chemistry, Beijing Normal University, Beijing, People’s Republic China

Affiliation College of Chemistry, Beijing Normal University, Beijing, People’s Republic China

Guangju Chen

wangy@bnu.edu.cn (YW); gjchen@bnu.edu.cn (GC)

Current address: College of Chemistry, Beijing Normal University, Beijing, People’s Republic China

Affiliation College of Chemistry, Beijing Normal University, Beijing, People’s Republic China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YW GC. Performed the experiments: GW. Analyzed the data: GW CL. Wrote the paper: GW YW.