title: Redetermined crystal structure of β-dl-me-thio-nine at 320 K.
abstract: The structure of β-dl-me-thio-nine, 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 mol-ecular 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 hydro-philic core of each mol-ecular 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.
authors.affiliation: Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway.
authors.forename: Carl Henrik
authors.initials: CH
authors.lastname: Görbitz
authors.affiliation: Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway.
authors.forename: Jan Christian
authors.initials: JC
authors.lastname: Paulsen
authors.affiliation: Department of Physics, University of Oslo, PO Box 1048 Blindern, N-0316 Oslo, Norway.
authors.forename: Jon
authors.initials: J
authors.lastname: Borgersen
keywords: amino acid; crystal structure; disorder; phase transition