Redetermined crystal structure of β-dl-methionine at 320 K

Acta Crystallographica Section E: Crystallographic Communications

Carl Henrik Görbitz¹  Jan Christian Paulsen¹  Jon Borgersen² 

[1] Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway;Department of Physics, University of Oslo, PO Box 1048 Blindern, N-0316 Oslo, Norway;

关键词: crystal structure;    amino acid;    phase transition;    disorder;   

DOI  :  10.1107/S2056989015008749

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown