1. Contribution from the Department of Chemistry, Faculty of Science, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, and Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-0026, Japan