Issue 43, 2018

Temperature-induced polymorphism in methyl stearate


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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Article information

Article type
27 Jun 2018
01 Aug 2018
First published
02 Aug 2018
This article is Open Access
Creative Commons BY license

CrystEngComm, 2018,20, 6885-6893

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, 20, 6885 DOI: 10.1039/C8CE01055B

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