The structure of 1,3-butadiene clusters: Benchmarking the density-functional based tight-binding method and finite temperature properties

J. Douady*, A. Simon, M. Rapacioli, F. Calvo, E. Yurtsever, A. Tekin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Molecular clusters of 1,3-butadiene were theoretically investigated using a variety of approaches, encompassing classical force fields and different quantum chemical (QC) methods, as well as density-functional-based tight-binding (DFTB) in its self-consistent-charge (SCC) version. Upon suitable reparametrization, SCC-DFTB reproduces the energy difference and torsional barrier of the trans and gauche conformers of the 1,3-butadiene monomer predicted at the QC level. Clusters of pure trans and gauche conformers containing up to 20 monomers were studied separately, their energy landscapes being explored using the force fields, then locally reoptimized using DFT or SCC-DFTB. The all-trans clusters are generally found to be lower in energy and produce well-ordered structures in which the planar molecules are arranged according to a herringbone motif. Clusters of molecules in the gauche configuration are comparatively much more isotropic. Mixed clusters containing a single gauche molecule were also studied and found to keep the herringbone motif, the gauche impurity usually residing outside. In those clusters, the strain exerted by the cluster on the gauche molecule leads to significant geometrical distortion of the dihedral angle already at zero temperature. Finally, the finite temperature properties were addressed at the force field level, and the results indicate that the more ordered all-trans clusters are also prone to sharper melting mechanisms.

Original languageEnglish
Article number41
JournalTheoretical Chemistry Accounts
Volume140
Issue number4
DOIs
Publication statusPublished - Apr 2021

Bibliographical note

Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

Funding

This work was supported by the ANR JCJC FRAPA, Grant ANR-18-CE30-0021 of the French Agence Nationale de la Recherche. Suvasthika Indrajith, Alicja Domaracka and Patrick Rousseau are gratefully acknowledged for stimulating discussions. We gratefully acknowledge financial support from GDR EMIE 3533. We also thank C. Falvo for calculations with the AIREBO potential.

FundersFunder number
Agence Nationale de la RechercheGDR EMIE 3533

    Keywords

    • 1,3 butadiene
    • Density-functional based tight-binding
    • Molecular clusters
    • Molecular modeling

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