1. Department of Chemistry and Biochemistry and Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309; Laboratoire de Recherches sur la Réactivité des Solides, UMR 5613, Université de Bourgogne, 9 Avenue A. Savary BP 47870, 21078 Dijon Cedex, France; and Department of Chemistry and Materials Science Institute, University of Oregon, Eugene, Oregon 97403