1. State Key Laboratory of Structural Chemistry, National Engineering Research Center for Optoelectronic Crystalline Materials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China, Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, U.S.A., and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China