1. Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, 4-3-16, Jonan, Yonezawa 992-8510, Japan
2. Kureha Corporation, 16, Ochiai, Nishiki-machi, Iwaki 974-8686, Japan
3. Faculty of Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa 992-8510, Japan