1. Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin, Kiryu, Gunma 376-8515, Japan
2. Faculty of Engineering, Yamagata University, Jonan 4-3-16, Yonezawa 992-8510, Japan
3. Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Jonan 4-3-16, Yonezawa 992-8510, Japan
4. Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States