Two helium atoms inside fullerenes: probing the internal magnetic field in C60(6-) and C70(6-) |
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| Authors: | Sternfeld Tamar Hoffman Roy E Saunders Martin Cross R James Syamala M S Rabinovitz Mordecai |
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| Institution: | Department of Organic Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel. |
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| Abstract: | 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-. |
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