1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
2. Jiangxi Time Chemical Company, Ltd, Fuzhou 344800, P. R. China
3. School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R.China
4. School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007 Henan, P. R. China