1. Contribution from the Institute for Nano-Science and Engineering Technology and Center for Advanced Materials, Department of Chemistry, University of Massachusetts, Lowell, Massachusetts 01854, Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi-110 007 India, Natick Soldier Center, U.S. Army Soldier and Biological Chemical Command, Kansas Street, Natick, Massachusetts 01760, and Department of Health and Clinical Sciences, University of Massachusetts, Lowell, Massachusetts 01854