1. Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan; Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji-shi, Tokyo 192-0397, Japan; and Energy Conversion and Storage Technology, Applied Research Center, Research and Development Department, Osaka Gas Co., Ltd. 6-19-9, Torishima, Konohana-ku, Osaka 554-0051, Japan