1. Department of Chemistry, Soochow University, Taipei, Taiwan, Instrumentation Center, National Taiwan University, Taipei, Taiwan, National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan, and Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Acad. Lavrentiev pr., Novosilbirsk 630090, Russia