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Calculation of Diamagnetic Susceptibility Tensors of Organic Crystals: From Coronene to Pharmaceutical Polymorphs

Guo, R; Uddin, MN; Price, LS; Price, SL; (2020) Calculation of Diamagnetic Susceptibility Tensors of Organic Crystals: From Coronene to Pharmaceutical Polymorphs. The Journal of Physical Chemistry A , 124 (7) pp. 1409-1420. 10.1021/acs.jpca.9b07104. Green open access

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Abstract

Understanding why crystallization in strong magnetic fields can lead to new polymorphs requires methods to calculate the diamagnetic response of organic molecular crystals. We develop the calculation of the macroscopic diamagnetic susceptibility tensor, χ^{cryst}, for organic molecular crystals using periodic density functional methods. The crystal magnetic susceptibility tensor, χ^{cryst}, for all experimentally known polymorphs, and its molecular counterpart, χ^{mol}, are calculated for flexible pharmaceuticals such as carbamazepine, flufenamic acid, and chalcones, and rigid molecules, such as benzene, pyridine, acridine, anthracene, and coronene, whose molecular magnetic properties have been traditionally studied. A tensor addition method is developed to approximate the crystal diamagnetic susceptibility tensor, χ^{cryst}, from the molecular one, χ^{mol}, giving good agreement with those calculated directly using the more costly periodic density functional method for χ^{cryst}. The response of pharmaceutical molecules and crystals to magnetic fields, as embodied by χ^{cryst}, is largely determined by the packing in the crystal, as well as the molecular conformation. The anisotropy of χ^{cryst} can vary considerably between polymorphs though the isotropic terms are fairly constant. The implications for developing a computational method for predicting whether crystallization in a magnetic field could produce a novel or different polymorph are discussed.

Type: Article
Title: Calculation of Diamagnetic Susceptibility Tensors of Organic Crystals: From Coronene to Pharmaceutical Polymorphs
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.jpca.9b07104
Publisher version: https://doi.org/10.1021/acs.jpca.9b07104
Language: English
Additional information: © 2020 American Chemical Society. ACS AuthorChoice with CC-BY license (https://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html).
Keywords: Crystals, Crystal structure, Molecules, Magnetic properties, Pharmaceuticals
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10092867
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