Inside information: The NMR signal of the molecular hydrogen in H2@C602− appears at extraordinarily low field (δ=26.36 ppm) relative to that of neutral H2@C60. This can be explained by the decrease in aromaticity of the C60 cage upon 2 e reduction. Spherical delocalization of the added two electrons over the π system of the fullerene cage is thought to be responsible for the drastic change in fullerene aromaticity.
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Murata et al. (2008) studied this question.
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