1. Environmental Education Center, Miyagi University of Education, Sendai 980-0845, Japan, Department of Chemistry, Faculty of Education, Yamagata University, Yamagata 990-8560, Japan, The Japan Association of Chemistry, Itsutsubashi 1-4-24, Sendai 980-0022, Japan, and Institute for Chemical Reaction Science, Tohoku University, Sendai 980-8577, Japan