1. Laboratory for Computational and Applied Chemistry, Department of Chemistry, Faculty of Science and Center of Nanotechnology, Kasetsart University, Bangkok 10900, Thailand, NANOTEC Center of Excellence, National Nanotechnology Center, Kasetsart University, Bangkok 10900, Thailand, and Department of Chemistry, Université Bordeaux 1, 351 Cours de la Libération, Building A12, F-33405 Talence cedex, France