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Issue 37, 2020

Atomistic simulations of the aggregation of small aromatic molecules in homogenous and heterogenous mixtures

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Abstract

The relatively weak London dispersion forces are the only interactions that could cause aggregation between simple aromatic molecules. The use of molecular dynamics and high-level ab initio computer simulations has been used to describe the aggregation and interactions between molecular systems containing benzene, naphthalene and anthracene. Mixtures containing one type of molecule (homogenous) and more than one type of molecule (heterogenous) were considered. Our results indicate that as molecular weight increases so does the temperature at which aggregation will occur. In all simulations, the mechanism of aggregation is through small clusters coalescing into larger clusters. The structural analysis of the molecules within the clusters reveals that benzene will orient itself in T-shaped and parallel displaced configurations. Molecules of anthracene prefer to orient themselves in a similar manner to a bulk crystal with no T-shaped configuration observed. The aggregation of these aromatic molecules is discussed in the context of astrochemistry with particular reference to the dust formation region around stars.

Graphical abstract: Atomistic simulations of the aggregation of small aromatic molecules in homogenous and heterogenous mixtures

Supplementary files

Article information


Submitted
14 May 2020
Accepted
31 Jul 2020
First published
31 Jul 2020

Phys. Chem. Chem. Phys., 2020,22, 21005-21014
Article type
Paper

Atomistic simulations of the aggregation of small aromatic molecules in homogenous and heterogenous mixtures

M. Thomas, I. Suarez-Martinez, L. Yu, A. Karton, G. S. Chandler, M. Robinson, I. Cherchneff, D. Talbi and D. Spagnoli, Phys. Chem. Chem. Phys., 2020, 22, 21005 DOI: 10.1039/D0CP02622K

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