Aromatic character of O h -C 24 N 24 . A cavernous nitride fullerene bearing N 4 -macrocycle motifs
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Spherical fullerenes offer noteworthy structures usually involving six- and five-membered faces, with application in technological issues. In this sense, cavernous spherical-like structures bearing larger holes provide interesting examples for further understanding of structure-properties relationship. Here, we explored the magnetic response of a proposed cavernous nitride fullerene, C 24 N 24 , which has a O h -symmetry with six N 4 -macrocyclic and eight 1,3,5-triazine faces displaying 48-π electrons. C 24 N 24 exhibits a local aromatic behavior owing to the contrasting antiaromatic response of the N 4 -macrocyclic faces and the aromatic character of the 1,3,5-triazine faces. Thus, the overall structure is ascribed as a local aromatic species, where the triazine faces exhibit the characteristic shielding cone for aromatic rings. Furthermore, the constructive combination of local shielding cones in C 24 N 24 delivers a related shielding-cone response, as expected for a perfect aromatic cage. Hence, the local aromatic/nonaromatic/antiaromatic sections exhibit an additive or subtractive interaction, leading to a characteristic response inherent to the nature of the spherical cage. We expect that further study of the interplay between different aromatic and antiaromatic faces in fullerene-like cages can deliver interesting pseudo-aromatic or pseudo-antiaromatic spherical species. © 2019 Wiley Periodicals, Inc.
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