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Issue 28, 2019
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Noble gas dimers confined inside C70

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The potential energy surfaces for the interior rotation of a series of pairs of noble gas atoms encapsulated in the C70 cavity have been explored. He2@C70, Ne2@C70, Ar2@C70, HeNe@C70, HeAr@C70 and NeAr@C70 were chosen as case studies. Our calculations suggest stable minima with the two noble gas atoms lying along the symmetry axis of the fullerene. Transition states for the rotations are expected to occur when the two atoms are located in the symmetry plane perpendicular to the C5 axis. The energy barriers for the rotations are predicted to be in the 5–64 kcal mol−1 range, significantly increasing with the size of the noble gas atoms inside C70. These energy barriers lead to a wide range of rate constants, including those characteristic of very fast internal rotations, of the order of k = 2.40 × 109 s−1 for He2@C70, and those describing very slow rotations, of the order of k = 1.80 × 10−33 s−1 for Ar2@C70. It is mandatory to correct for the basis set superposition error to calculate accurate binding energies.

Graphical abstract: Noble gas dimers confined inside C70

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The article was received on 28 May 2019, accepted on 01 Jul 2019 and first published on 02 Jul 2019

Article type: Paper
DOI: 10.1039/C9CP03015H
Phys. Chem. Chem. Phys., 2019,21, 15815-15822

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    Noble gas dimers confined inside C70

    S. Gómez and A. Restrepo, Phys. Chem. Chem. Phys., 2019, 21, 15815
    DOI: 10.1039/C9CP03015H

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