1. Department of Organic Materials ScienceGraduate School of Organic Materials ScienceYamagata University 4‐3‐16 Jonan 992‐8510 Japan
2. Division of Applied ChemistryFaculty of EngineeringHokkaido University Kita 13, Nishi 8, Kita‐ku, Sapporo Hokkaido 060‐8628 Japan