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Fullerene Thermochemical Stability: Accurate Heats of Formation for Small Fullerenes, the Importance of Structural Deformation on Reactivity, and the Special Stability of C60

Authors :
Bun Chan
Source :
The Journal of Physical Chemistry A. 124(33):6688-6698
Publication Year :
2020
Publisher :
American Chemical Society, 2020.

Abstract

We have used quantum chemistry computations, in conjunction with isodesmic-type reactions, to obtain accurate heats of formation (HoFs) for the small fullerenes C20 (2358.2 ± 8.0 kJ mol-1), C24 (2566.2 ± 7.6), and the lowest-energy isomers of C32 (2461.1 ± 15.4), C42 (2629.0 ± 20.5), and C54 (2686.2 ± 25.3). As part of this endeavor, we have also obtained accurate HoFs for several medium-sized molecules, namely 216.6 ± 1.4 for fulvene, 375.5 ± 1.5 for pentalene, 670.8 ± 2.9 for acepentalene, and 262.7 ± 2.5 for acenaphthylene. We combine the energies of the small fullerenes and previously obtained energies for larger fullerenes (from C60 to C6000) into a full picture of fullerene thermochemical stability. In general, the per-carbon energies can be reasonably approximated by the "R+D"model that we have previously developed [ Chan et al. J. Chem. Theory Comput. 2019, 15, 1255-1264 ], which takes into account Resonance and structural Deformation factors. In a case study on C54, we find that most of the high-deformation-energy atoms correspond to the sites of the C-Cl bond in the experimentally captured C54Cl8.In another case study, we find that C60 has the lowest value for the maximum local-deformation energy when compared with similar-sized fullerenes, which is consistent with its "special stability". These results are indicative of structural deformation playing an important role in the reactivity of fullerenes.<br />The journal of physical chemistry. A, 124(33), pp.6688-6698; 2020

Details

Language :
English
ISSN :
10895639
Volume :
124
Issue :
33
Database :
OpenAIRE
Journal :
The Journal of Physical Chemistry A
Accession number :
edsair.doi.dedup.....e91d58b25b63aab11a469c5f6c7a7570