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A structure determination protocol based on combined analysis of 3D-ED data, powder XRD data, solid-state NMR data and DFT-D calculations reveals the structure of a new polymorph of L-tyrosine

Smalley, Christopher, Hoskyns, Harriet E., Hughes, Colan E, Johnstone, Duncan N., Willhammar, Tom, Young, Mark T., Pickard, Chris J., Logsdail, Andrew J., Midgley, Paul and Harris, Kenneth D. M. 2022. A structure determination protocol based on combined analysis of 3D-ED data, powder XRD data, solid-state NMR data and DFT-D calculations reveals the structure of a new polymorph of L-tyrosine. Chemical Science 13 (18) , pp. 5277-5288. 10.1039/D1SC06467C

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Abstract

We report the crystal structure of a new polymorph of L-tyrosine (denoted the β polymorph), prepared by crystallization from the gas phase following vacuum sublimation. Structure determination was carried out by combined analysis of three-dimensional electron diffraction (3D-ED) data and powder X-ray diffraction (XRD) data. Specifically, 3D-ED data were required for reliable unit cell determination and space group assignment, with structure solution carried out independently from both 3D-ED data and powder XRD data using the direct-space strategy for structure solution implemented using a genetic algorithm. Structure refinement was carried out both from powder XRD data using the Rietveld profile refinement technique and from 3D-ED data. The final refined structure was validated both by periodic DFT-D calculations, which confirm that the structure corresponds to an energy minimum on the energy landscape, and by the fact that the values of isotropic 13C NMR chemical shifts calculated for the crystal structure using DFT-D methodology are in good agreement with the experimental high-resolution solid-state 13C NMR spectrum. Based on DFT-D calculations using the PBE0-MBD method, the β polymorph is meta-stable with respect to the previously reported crystal structure of L-tyrosine (now denoted the α polymorph). Crystal structure prediction calculations using the AIRSS approach suggest that there are three other plausible crystalline polymorphs of L-tyrosine, with higher energy than the α and β polymorphs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Chemistry
Additional Information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Publisher: Royal Society of Chemistry
ISSN: 2041-6520
Funders: UKRI and EPSRC
Date of First Compliant Deposit: 12 April 2022
Date of Acceptance: 29 March 2022
Last Modified: 31 May 2022 07:29
URI: https://orca.cardiff.ac.uk/id/eprint/149158

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