Molecular and Spin Dynamics in the Paramagnetic Endohedral Fullerene Gd3N@C80
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- 作者：B. N谩fr谩di ; 脕. Antal ; 脕. P谩sztor ; L. Forr贸 ; L.F. Kiss ; T. Feh茅r ; 脡. Kov谩ts ; S. Pekker ; A. J谩nossy
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：November 15, 2012
- 年：2012
- 卷：3
- 期：22
- 页码：3291-3296
- 全文大小：333K
- 年卷期：v.3,no.22(November 15, 2012)
- ISSN：1948-7185
文摘
Gd<sub>3sub>N@C<sub>80sub> endohedral fullerene, a starting material for a potential magnetic resonance imaging contrast agent, is investigated by high-frequency electron spin resonance (ESR) and SQUID magnetometry. The magnetic moments of the three Gd ions of the endohedral Gd<sub>3sub>N molecule are ferromagnetically aligned at low temperatures and are uncorrelated at high temperatures. The 4 T broad 210 and 315 GHz ESR spectra measured at 2 K are well-described by a single transition between the lowest Zeeman levels of static molecules shifted by fine structure effects. At higher temperatures there is a gradual transition to a rotating state. At ambient temperatures the rotation frequency is much larger than the fine structure broadening, and a single ESR line is observed at a gyromagnetic ratio of g = 1.995.