1. Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606‐8502, Japan and PRESTO, Japan Science and Technology Agency, Japan, Fax: (internat.) + 81‐75‐753‐3970
2. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615‐8510, Japan, Fax: (internat.) + 81‐75‐383‐2438