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Ganin, Alexey Yu.
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article
Methylaminated potassium fulleride, (CH3NH2)K 3C60: Towards hyperexpanded fulleride lattices
Abstract
<p>Co-intercalation of methylamine molecules into the cubic K<sub>3</sub>C<sub>60</sub> lattice affords the fulleride (CH<sub>3</sub>NH<sub>2</sub>)K<sub>3</sub>C<sub>60</sub>, which was characterized by Raman and MAS <sup>13</sup>C and <sup>1</sup>H NMR spectroscopy. The high-resolution synchrotron X-ray powder diffraction technique was employed to determine its crystal structure at ambient temperature. We find that CH<sub>3</sub>NH<sub>2</sub> bonds to K+ ions residing in the pseudo-octahedral interstices, thereby providing an efficient and facile route to hyperexpanded close-packed strongly anisotropic fulleride lattices, while retaining the electronic contact between the C<sub>60</sub><sup>3-</sup> anions. Preliminary evidence for the occurrence of a transition to an antiferromagnetic state at low temperature is also presented, consistent with the proximity of the present system to the metal-insulator boundary of the electronic phase diagram of C<sub>60</sub><sup>3-</sup> fullerides.</p>