D. Chen, D.W. Szczepanik, J. Zhu, A. Muñoz-Castro (
), M. Solà (
)
Chemistry - A European Journal 27 (2021) 802−808. DOI: 10.1002/CHEM.202004322.
URL
The isolated-pentagon rule (IPR) is a determining structural feature accounting for hollow fullerene stabilization and properties related to C
n (
n ≥ 60) cages. The recent characterization of an unprecedented non-IPR hydrofullerene, C
2v-C
66H
4, bearing two heptagons with adjacent fused-pentagons motif, largely dismiss this feature. Herein, employing DFT calculations, we explore its
13C-NMR pattern and aromatic behavior. Our results unravel the unique features of C
66H
4 in comparison to pristine C
60, where three π-aromatic circuits are found at the bottom section of this fullerene derivative. In addition, under specific orientations of the external field, certain π-aromatic circuits are enabled, resulting in a more aromatic fullerene than C
60, but lower in comparison to the spherical aromatic C
606- fulleride. Noteworthy, under a field-aligned along with the saturated carbon atoms, non-aromatic characteristics are exposed. This reveals that spherical-like cages can involve a complex magnetic response that heavily depends on the orientation of the applied field.