1. Department of Chemistry, Portland State University, Portland, OR 97207, USA
2. Macromolecular and Supramolecular Photophysics and Photochemistry Laboratory (PPSM Laboratory), CNRS UMR8531, Ecole Normale Supérieure de Cachan, 61 Avenue du Président Wilson, 94235 Cachan Cedex, France
3. Department of Materials Science and Engineering, The University of Tennessee, 306D Dougherty Engineering Building, Knoxville, TN 37996-2200, USA
4. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
5. Department of Chemistry, University of Massachusetts Lowell, Olney Hall 510, Lowell, MA 01854, USA