1. Department of Chemistry and Biochemistry, Queens College of the City University of New York, 65-30 Kissena Boulevard, Flushing, New York 11367-1597, United States
2. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
3. Experimental Physics IV and Bayreuth Institute of Macromolecular Research (BIMF), Universität Bayreuth, 95447 Bayreuth, Germany