1. Contribution from the Department of Material Science, College of Integrated Arts and Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan, Chemistry Department for Materials, Faculty of Engineering, Mie University, 1515 Kamihama, Tsu 514-8507, Japan, and Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan