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, C. R. Pulham

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
JournalCrystEngComm
Early online date2 Aug 2018
DOIs
Publication statusE-pub ahead of print - 2 Aug 2018

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