Periodic density functional theory calculations for 3-dimensional polyacetylene with empirical dispersion terms

We report periodic B3LYP density functional theory calculations for three-dimensional (3D) trans-polyacetylene (t-PA) fibers. Empirical dispersion terms, as proposed by Grimme, are included with an appropriate re-scaling to yield the B3LYP+D* method implemented in CRYSTAL06. The dispersion correctio...

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Published inPhysical chemistry chemical physics : PCCP Vol. 12; no. 13; pp. 3289 - 3293
Main Authors Zicovich-Wilson, C M, Kirtman, B, Civalleri, B, Ramírez-Solís, A
Format Journal Article
LanguageEnglish
Published England 01.01.2010
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Summary:We report periodic B3LYP density functional theory calculations for three-dimensional (3D) trans-polyacetylene (t-PA) fibers. Empirical dispersion terms, as proposed by Grimme, are included with an appropriate re-scaling to yield the B3LYP+D* method implemented in CRYSTAL06. The dispersion corrections are critical for obtaining correct unit cell parameters. In our calculations the out-of-phase P2(1)/n structure turns out to be a transition state for the interchain relative translational motion, which lies about 0.35 kcal mol(-1) above the two symmetrically located in-phase P2(1)/a minima. These results provide a possible new explanation for the observed XRD intensities. Our calculations should also be useful for comparison with more costly non-empirical treatments of 3D PA and other pi-conjugated polymers.
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ISSN:1463-9076
1463-9084
DOI:10.1039/b918539a