LI Xiao-Qian1, LIU Cui1, WANG Lei2**, HUANG Yan-Ning3, SHI Fan2
1. Qingdao No.39 Middle School in Shandong Province, Qingdao 266100,China;
2. College of Chemistry, Beijing Normal University, Beijing 100875,China;
3. College of Chemistry, Capital Normal University, Beijing 100048,China