| Autor: |
Yongjun Li, Ronald G. Lawler, Judy Y.-C. Chen, Xuegong Lei, Yasujiro Murata, Koichi Komatsu, Nicholas J. Turro |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
The Journal of Physical Chemistry Letters. 3:1165-1168 |
| ISSN: |
1948-7185 |
| DOI: |
10.1021/jz3002794 |
| Popis: |
The successful synthesis of H2O@C60 makes possible the study of magnetic interactions of an isolated water molecule in a geometrically well-defined hydrophobic environment. Comparisons are made between the T1 values of H2O@C60 and the previously studied H2@C60 and their nitroxide derivatives. The value of T1 is approximately six times longer for H2O@C60 than for H2@C60 at room temperature, is independent of solvent viscosity or polarity, and increases monotonically with decreasing temperature, implying that T1 is dominated by the spin-rotation interaction. Paramagnetic nitroxides, either attached covalently to the C60 cage or added to the medium, produce strikingly similar T1 enhancements for H2O@C60 and H2@C60 that are consistent with through-space interaction between the internal nuclear spins and the external electron spin. This indicates that it should be possible to apply to the endo-H2O molecule the same methodologies for manipulating the ortho and para spin isomers that have proven successful for H2@C60. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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