1. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095; Department of Chemistry and Biochemistry, Department of Materials Engineering, and Center for Polymers and Organic Solids (CPOS), University of California, Santa Barbara, California 93106; Department of Materials Science, University of Southern California, Los Angeles, California 90089; and Polymer and Fiber Engineering Department, Auburn University, Auburn, Alabama 36849