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Accuracy and reproducibility in crystal structure prediction: The curious case of ROY

Abstract

We present the results of a new crystal structure prediction of ROY performed with the GRACE program, including the first wide search for Z' =2 structures. In addition, we present calculations of lattice-vibrational contributions to the polymorphs’ relative stability. Because of excessive electron delocalization, the polymorphs of ROY constitute a surprisingly challenging system for density functional approximations, raising troubling questions regarding the performance of some of the most popular computational methods. Despite this, lattice dynamics calculations performed very well in reproducing the experimental cyano-group stretching frequencies, allowing us to propose a plausible candidate structure for the RPL polymorph, identified by comparing experimental Raman frequencies with calculated phonon modes.

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Publication details

The article was received on 06 Nov 2018, accepted on 27 Nov 2018 and first published on 30 Nov 2018


Article type: Paper
DOI: 10.1039/C8CE01902A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Accuracy and reproducibility in crystal structure prediction: The curious case of ROY

    J. Nyman, L. Yu and S. Reutzel-Edens, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01902A

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