1. Contribution from the Department of Chemistry, Shandong University, Jinan 250100, China, Laboratory of Synchrotron Radiation, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China, Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China, and Synthesis and Molecular Recognition Program, School of Physical and Chemical Sciences, Queensland University of Technology, G.P.O. Box 2434, Brisbane, Qld. 4001, Australia