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Polymorph evolution during crystal growth studied by 3D electron diffraction
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 72020 (English)In: IUCrJ, ISSN 0972-6918, E-ISSN 2052-2525, Vol. 7, p. 5-9Article in journal (Refereed) Published
Abstract [en]

3D electron diffraction (3DED) has been used to follow polymorph evolution in the crystallization of glycine from aqueous solution. The three polymorphs of glycine which exist under ambient conditions follow the stability order beta < alpha < gamma. The least stable beta polymorph forms within the first 3 min, but this begins to yield the alpha-form after only 1 min more. Both structures could be determined from continuous rotation electron diffraction data collected in less than 20 s on crystals of thickness similar to 100 nm. Even though the gamma-form is thermodynamically the most stable polymorph, kinetics favour the alpha-form, which dominates after prolonged standing. In the same sample, some beta and one crystallite of the gamma polymorph were also observed.

Place, publisher, year, edition, pages
2020. Vol. 7, p. 5-9
Keywords [en]
crystallization, polymorphism, cryoTEM, electron diffraction, 3DED, glycine
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-178647DOI: 10.1107/S2052252519016105ISI: 000506338000003PubMedID: 31949899OAI: oai:DiVA.org:su-178647DiVA, id: diva2:1396343
Available from: 2020-02-26 Created: 2020-02-26 Last updated: 2020-02-26Bibliographically approved

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Xu, HongyiClabbers, Max T. B.Lightowler, MollyZou, Xiaodong
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