1. Institute for Molecular Science, Myodaiji, Okazaki 444-8787, Japan, New Products Development Division, Kanto Denka Kogyo Co., Ltd., 1-2-1 Marunouchi, Chiyoda-ku, Tokyo 100-0005, Japan, and NHK Science and Technical Research Laboratories, Kinuta, Setagaya-ku, Tokyo 157-8510, Japan