1. Department of Chemistry, Shiga University of Medical Science, Seta, Otsu, Shiga 520-2192, Japan, School of Natural and Environmental Sciences, Priory Street, Coventry University, Coventry, CV1 5FB, UK, and Laboratoire de Chimie Moléculaire et Environnement, Université de Savoie, 73376 Le Bourget du Lac Cedex, France