1. Department of Chemistry; Northeast Normal University; 5268 Renmin Street, Changchun Jilin 130024 P. R. China
2. State Key Laboratory of Rare Earth Resource Utilization; Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130021 P. R. China
3. Department of Chemistry and Biochemistry; University of California, Los Angeles; 609 Charles E. Yong Dr. E Los Angeles CA 90095 USA