1. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
2. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
3. Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 30206, United States
4. Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
5. Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States