1. Department of Chemistry, School of Medicine, Toho University, Ota-ku, Tokyo 143-8540, Japan, Division of Chemistry, Graduate School of Science, Toho University, Funabashi 274-8510, Japan, Research Center for Materials with Integrated Properties, Toho University, Funabashi 274-8510, Japan, and Laboratoire Sciences Chimiques de Rennes, UMR CNRS 6226, Université de Rennes 1, 35042 Rennes Cedex, France