1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France, Istituto per la Sintesi Organica e la Fotoreattività, Molecular Photoscience Group, Consiglio Nazionale delle Ricerche, Via Gobetti 101, 40129 Bologna, Italy, and Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan