1. Contribution from the Department of Chemistry, The University of Texas at Dallas, 2601 North Floyd Road, Richardson, Texas 75083-0688, NanoTech Institute, The University of Texas at Dallas, 2601 North Floyd Road, Richardson, Texas 75083-0688, Department of Molecular and Cell Biology, The University of Texas at Dallas, 2601 North Floyd Road, Richardson, Texas 75083-0688, and Zyvex Corporation, 1321 North Plano Road, Richardson, Texas 75081-2426