1. Institute for Fundamental Research of Organic Chemistry, Kyushu University, Fukuoka 812-8581, Japan, Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan, and Division of Material and Life Sciences, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan