Two helium atoms inside fullerenes: probing the internal magnetic field in C60(6-) and C70(6-)

A 3He NMR resonance of C606- containing He is assigned to He2@C606-, thus showing that C60 can also accommodate two helium atoms. The ratio of the di-helium compound relative to the mono- is 1:200, 10 times lower than the equivalent counterpart of C70. The 3He NMR chemical shift of He2@C606- is 0.09...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2002-07, Vol.124 (30), p.8786-8787
Main Authors: Sternfeld, Tamar, Hoffman, Roy E, Saunders, Martin, Cross, R James, Syamala, M S, Rabinovitz, Mordecai
Format: Article
Language:English
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Summary:A 3He NMR resonance of C606- containing He is assigned to He2@C606-, thus showing that C60 can also accommodate two helium atoms. The ratio of the di-helium compound relative to the mono- is 1:200, 10 times lower than the equivalent counterpart of C70. The 3He NMR chemical shift of He2@C606- is 0.093 ppm downfield from the already known resonance of He@C606-. In the reduced endohedral mono- and di-helium C70, the 3He NMR chemical shift of He2@C706- is 0.154 ppm upfield from the peak of He@C706-.
ISSN:0002-7863
DOI:10.1021/ja025990y