1. Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, P. R. China, State Key Laboratory of Structural Chemistry, Fuzhou, Fujian 350002, P. R. China, Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99354, and Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, MS K8-88, Post Office Box 999, Richland, Washington 99352