1. Laboratoire de Chimie Supramoléculaires, Institut de Science et d'Ingénierie Supramoléculaires, Université Louis Pasteur de Strasbourg, 8 Allée Gaspard Monge, B.P.70028, F-67083 Strasbourg Cedex, France, Department of Environmental Sciences and Engineering, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7431, and Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006