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W- and X-band EPR investigation of Sc3@C82

✍ Scribed by Jürgen Rahmer; Lothar Dunsch; Harry Dorn; Jens Mende; Michael Mehring

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
348 KB
Volume
43
Category
Article
ISSN
0749-1581

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✦ Synopsis

Sc 3 @C 82 has been investigated by X-and W-band EPR. The isotropic and anisotropic hyperfine interaction between the electron spin and the 45 Sc nuclei of the Sc 3 -triangle was evaluated. In addition, a statistical model analyzing the 13 C hyperfine coupling of the C 82 cage is applied and its consequences for the charge transfer are discussed. The observed EPR line broadening with decreasing temperature was modeled with a simple exchange model, which considers the molecular motion of the Sc 3 -triangle inside the C 82 cage. This allowed the estimation of the linewidth contributions of the hyperfine-and g-anisotropies as well as the temperature dependence of the exchange rate, which increases rapidly with temperature and follows an exponential law.

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