1. Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
2. Department of Chemistry, Center for Macromolecular Science and Engineering, University of Florida, Gainesville, Florida 32611-7200,
United States
3. School of Chemistry
and Biochemistry,
School of Materials Science and Engineering, Center for Organic Photonics
and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States