1. Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
2. Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, United States
3. State
Key Laboratory of Molecular Engineering of Polymers, Advanced Material
Laboratory, Department of Macromolecular Science, Fudan University, Shanghai 200433, People’s Republic of China
4. School
of Computational Sciences, Korea Institute for Advanced Study, Seoul 02455, Korea