1. Graduate School of Engineering, Yokohama National University, Tokiwadai 79-5, Hodogaya-ku, Yokohama 240-8501, Japan, Departamento de Química Física, Facultad de Química, Universidad de Santiago E-15706, Santiago de Compostela, Spain, Department of Chemistry, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan, and Dow Corning Toray Silicone Co. Ltd., Chigusa-Kaigan 2-2, Ichihara 299-01, Japan