1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
2. Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, D-76131, Karlsruhe, Germany
3. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072, P. R. China
4. Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
5. Institut für Anorganische Chemie, Universität Göttingen, Tammannstraße 4, D-37077 Göttingen, Germany
6. School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China