1. Department of Chemistry, Faculty of Science, Okayama University, Okayama 700‐8530, Japan, http://chem.okayama‐u.ac.jp/english/index.html
2. Photosynthesis Research Center, Graduate School of Natural Science and Technology, Okayama University Okayama 700‐8530, Japan
3. Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060‐0810, Japan
4. Department of Chemistry, Aichi University of Education, Kariya, Aichi 448‐8542, Japan