1. Contribution from the Laboratoire de Chimie Inorganique et Bioinorganique, Ecole Polytechnique Fédérale de Lausanne, EPFL-BCH, CH-1015 Lausanne, Switzerland, Department of Chemistry, the Center for Nanoscale Science and Technology, and the Center for Biological and Environmental Nanotechnology MS 60, Rice University, Houston, Texas 77251-1892, TDA Research Inc., 12345 West 52nd Avenue, Wheat Ridge, Colorado 80033, and Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas...