1. Department of Applied Chemistry, National Defense Academy of Japan, Yokosuka, Kanagawa 239-8686, Japan
2. Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
3. Center for Interphase Chemistry and Catalysis, K. U. Leuven, Kardinaal Mercierlaan 92, B-3001 Leuven, Belgium
4. Center for Research on Molecular Electronics and Photonics, K. U. Leuven, Celestijnenlaan 200-D, B-3001 Leuven, Belgium
5. Department of Chemistry, K. U. Leuven, Celestijnenlaan 200-F, B-3001 Leuven, Belgium