1. Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P R China, Equipe de dynamique des assemblages membranaires, UMR CNRS/UHP 7565, Université Henri Poincaré, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France, and Department of Chemistry, Nankai University, Tianjin, 300071, P R China