1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, P. R. China, http://hgxy.cqu.edu.cn/WebUI/Article/SiteClassList.aspx?FileName=gongyun1.htm
2. State Key Laboratory of Rare Earth Materials, Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China, http://yz.cqu.edu.cn/view_teacher.php?tid=18034