1. School
of Chemistry and Biochemistry, Center for Organic Photonics and Electronics
(COPE), Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
2. Laboratory
for Computational and Theoretical Chemistry of Advanced Materials,
Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
3. Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
4. Department
of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States