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

Acta Crystallographica Section E: Crystallographic Communications

Gö¹  rbitz, C.H.¹  Paulsen, J.C.² 

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

[2]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

学科分类：数学（综合）

来源: International Union of Crystallography

【 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】

CC BY