19F NMR and EPR study of fluorinated buckminsterfullerene C60F58
| Autor: | Alexander M. Panich, Alexander I. Shames, H. Selig |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Quantitative Biology::Biomolecules
Condensed matter physics Spin–lattice relaxation Dangling bond General Chemistry Fluorine-19 NMR Atmospheric temperature range Condensed Matter Physics law.invention chemistry.chemical_compound Paramagnetism Crystallography Buckminsterfullerene Unpaired electron chemistry law General Materials Science Electron paramagnetic resonance |
| Zdroj: | Journal of Physics and Chemistry of Solids. 63:483-489 |
| ISSN: | 0022-3697 |
| Popis: | Solid state 19 F NMR in the temperature range from 96 to 366 K and room temperature EPR studies of fluorinated buckminsterfullerene C 60 F 58 have been carried out. The temperature dependence of the line width and the spin–lattice relaxation time show hindered molecular motion with the activation energy of Δ E a =1.9 kcal/mol. Neither phase transition nor random rotation of C 60 F 58 have been obtained. The spin–lattice relaxation rate is strongly affected by the presence of paramagnetic centers, namely, dangling C–C bonds yielding localized unpaired electrons. Such broken bonds are caused by C–C bond rupture in a cage-opened structure of hyperfluorinated species. |
| Databáze: | OpenAIRE |
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