1. Research and Analytical Center for Giant Molecules, Graduate School of Science; Tohoku University; 6-3 Aramaki Aza Aoba, Aoba-ku Sendai 980-8578 Japan
2. Department of Chemistry, Graduate School of Science; Tohoku University; 6-3 Aramaki Aza Aoba, Aoba-ku Sendai 980-8578 Japan