1. Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Kojirakawa-machi 1-4-12, Yamagata 990-8560, Japan, Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan, and Fujitsu Limited, Nakase 1-9-3, Mihama-ku, Chiba 261-8588, Japan