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...

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Bibliographic Details
Published in:CrystEngComm 2018, Vol.20 (43), p.6885-6893
Main Authors: Liu, X., Gibbs, A. S., Nichol, G. S., Tang, C. C., Knight, K. S., Dowding, P. J., More, I., Pulham, C. R.
Format: Article
Language:English
Subjects:
Cooling
Crystal structure
Crystallization
Crystallography
Crystals
Monoclinic lattice
Polymorphism
Single crystals
Thermal expansion
X-ray diffraction
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Summary: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 CS 2 . Form IV (monoclinic, space group C 2 /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.
ISSN:1466-8033
1466-8033
DOI:10.1039/C8CE01055B