1. College of Chemistry and Materials Engineering Anhui Science and Technology University, Bengbu Anhui 233100 P. R.China
2. Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; Department of Chemistry Huaibei Normal University, Huaibei Anhui 235000 P. R. China
3. C Information College Huaibei Normal University Huaibei 235000 P. R. China