1. Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan, Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8850, Japan, and Department of Material Science, University of Hyogo, Kouto, Kamigori-cho, Hyogo 678-1297, Japan