1. Department of Chemistry; Faculty of Science; Niigata University; Nishi-ku Niigata 950-2181 Japan
2. Department of Chemistry; College of Science; Rikkyo University; Toshima-ku Tokyo 171-8501 Japan
3. Department of Chemistry; Graduate School of Science; Kyushu University; Nishi-ku Fukuoka 819-0395 Japan
4. Center for Instrumental Analysis; Institute for Research Promotion; Niigata University; Nishi-ku Niigata 950-2181 Japan