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Face indexing and shape analysis of salicylamide crystals grown in different solvents
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2019 (English)In: CrystEngComm, ISSN 1466-8033, E-ISSN 1466-8033, Vol. 21, no 16, p. 2648-2659Article in journal (Refereed) Published
Abstract [en]

The effect of solvent on salicylamide's crystal habit was investigated. Crystals grown experimentally in acetone, acetonitrile and methanol matched the attachment energy predicted rectangle plate vacuum habit. However, in ethyl acetate irregular hexagonal plate crystals form. This change in habit was found to be caused by the stunted growth of specific crystal faces during the crystallisation process. Single crystal and powder X-ray diffraction was carried out to rule out the possibility of a new polymorph. Given no new polymorphs were discovered, the changing habit makes face indexing of experimentally grown crystals difficult. A combination of experimental and modelling prediction tools was employed for the face indexing process. The interfacial angle between faces combined with preferred orientation P-XRD was found to be the most accurate and reliable method leading to successful identification of each salicylamide crystal face. The surface chemistry of each face was examined on a molecular level with insights into the possible growth attachment sites being made. It is deduced that ethyl acetate is adsorbed more strongly on the faces, the increased size of which, can explain the shape change.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019. Vol. 21, no 16, p. 2648-2659
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Chemical Sciences
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URN: urn:nbn:se:kth:diva-251835DOI: 10.1039/c9ce00049fISI: 000465358900004Scopus ID: 2-s2.0-85064403750OAI: oai:DiVA.org:kth-251835DiVA, id: diva2:1318965
Note

QC 20190529

Available from: 2019-05-29 Created: 2019-05-29 Last updated: 2019-06-11Bibliographically approved

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Rasmuson, Åke C.

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