1. Coordination Chemistry Institute & State Key Laboratory and Department of Electronic Science & Engineering, Nanjing University, Nanjing 210093, Department of Chemistry, Anqing Normal College, Anqing 246011, and State Key Lab Of Rare Earth Materials Chemistry & Applications, Peking University, Beijing 100871, People's Republic of China, and Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, Postfach 800665, D-70569 Stuttgart, Germany