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Temperature-induced polymorphism in methyl stearate

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Abstract

The crystallisation of methyl stearate under a range of crystallisation conditions has been studied and three new polymorphs have been identified and structurally characterised. Form III (monoclinic, space group Cc, Z = 8) was obtained at room temperature by slow evaporation of a saturated solution in CS2. Form IV (monoclinic, space group C2/c, Z = 4) was obtained by slow cooling of the melt. Both structures were characterised by single crystal X-ray diffraction. Form V (monoclinic, space group Cc, Z = 4) was obtained from the melt by rapid cooling. X-ray and neutron powder diffraction methods were employed in the determination of this structure. Form V shows highly anisotropic thermal expansion, with expansion along the crystallographic b-axis being substantially greater than along the other two axes.

Graphical abstract: Temperature-induced polymorphism in methyl stearate

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Publication details

The article was received on 27 Jun 2018, accepted on 01 Aug 2018 and first published on 02 Aug 2018


Article type: Paper
DOI: 10.1039/C8CE01055B
Citation: CrystEngComm, 2018, Advance Article
  • Open access: Creative Commons BY license
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    Temperature-induced polymorphism in methyl stearate

    X. Liu, A. S. Gibbs, G. S. Nichol, C. C. Tang, K. S. Knight, P. J. Dowding, I. More and C. R. Pulham, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE01055B

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