Abstract
The structure of β-dl-methionine, C5H11NO2S, in the space group C2/c, is here confirmed to be fully ordered all the way up to the phase transition at approximately 326 K, where displacive sliding of molecular bilayers gives the disordered P21/c α form [data at 340 K; Görbitz (2014). Acta Cryst. E70, 341–343]. The geometry of hydrogen bonds in LD–LD hydrogen-bonding patterns [Görbitz et al. (2009). Acta Cryst. B65, 393–400] at the hydrophilic core of each molecular bilayer are virtually unperturbed by the phase shift, but the C—C—S—C torsion angle of the side chain changes from trans at 320 K to gauche+ for the major conformation at 340 K.
Highlights
The structure of -dl-methionine, C5H11NO2S, in the space group C2/c, is here confirmed to be fully ordered all the way up to the phase transition at approximately 326 K, where displacive sliding of molecular bilayers gives the disordered P21/c form [data at 340 K; Gorbitz (2014)
B65, 393–400] at the hydrophilic core of each molecular bilayer are virtually unperturbed by the phase shift, but the C—C—S—C torsion angle of the side chain changes from trans at 320 K to gauche+ for the major conformation at 340 K
Supporting information for this paper is available from the IUCr electronic archives (Reference: SU5129)
Summary
The structure of -dl-methionine, C5H11NO2S, in the space group C2/c, is here confirmed to be fully ordered all the way up to the phase transition at approximately 326 K, where displacive sliding of molecular bilayers gives the disordered P21/c form [data at 340 K; Gorbitz (2014). Redetermined crystal structure of b-DL-methionine at 320 K Carl Henrik Gorbitz,a* Jan Christian Paulsena and Jon Borgersenb aDepartment of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway, and bDepartment of Physics, University of Oslo, PO Box 1048 Blindern, N0316 Oslo, Norway.
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