1. Department of Chemistry, Box 571227, Georgetown University, Washington, D.C. 20057, United States
2. Laboratory of Advanced Materials Chemistry, Division of Applied Chemistry, Hokkaido University,
N13W8, Kita-Ku, Sapporo, Hokkaido 060-8628, Japan
3. Department of Material Science and Technology, Tokyo University of Science, 6-3-1 Niijuku,
Katsushika-ku, Tokyo 125-8585, Japan