Journal Reference
Chemistry. 2015;21(29):10362-8.
Stevenson S1, Thompson HR2, Arvola KD2, Ghiassi KB3, Olmstead MM4, Balch AL5.
[expand title=”Show Affiliations”]- Department of Chemistry, Indiana-Purdue University Fort Wayne, 2101 E. Coliseum Blvd, Fort Wayne, IN, 46805 (USA). [email protected].
- Department of Chemistry, Indiana-Purdue University Fort Wayne, 2101 E. Coliseum Blvd, Fort Wayne, IN, 46805 (USA).
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis CA, 95616 (USA).
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis CA, 95616 (USA). [email protected].
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis CA, 95616 (USA). [email protected].
Abstract
By combining two chemical methods of purification, 4 mg of purified CeLu2 N@C80 was readily isolated from 500 mg of carbon soot extract without the use of recycling HPLC, a method which has previously been necessary to obtain pure samples of endohedral fullerenes. In stage 1, CeLu2 N@C80 was selectively precipitated by virtue of its low first oxidation potential (+0.01 V) and the judicious choice of MgCl2 as the Lewis acid precipitant. For stage 2, we used a stir and filter approach (SAFA), which employed the electron-rich NH2 groups immobilized on silica gel to selectively bind residual endohedrals and higher cage fullerenes that were contaminants from stage 1. Crystallographic analysis of CeLu2 N@C80 in the co-crystal CeLu2 N@Ih -C80 ⋅Ni(octaethylporphyrin)⋅2(toluene) reveals that the Ih -C80 cage is present with a pyramidalized CeLu2 N unit inside.
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