High-pressure polymorphism in l-cysteine: the crystal structures of l-cysteine-III and l-cysteine-IV

Moggach, S.A.; Allan, D.R.; Clark, S.J.; Gutmann, M.J.; Parsons, S.; Pulham, C.R.; Sawyer, L.

doi:10.1107/S0108768105038802

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 3
[R_4^4(16)]

ring motifs in (a) L-cysteine-I at ambient pressure, (b) L-cysteine-I at 1.8 GPa, (c) L-cysteine-III at 2.6 GPa and (d) L-cysteine-IV at 1.7 GPa. (a)–(c) are viewed along b, while (d) is viewed along c. N—H⋯O and C—H⋯O hydrogen bonds are drawn as black and orange dotted lines, respectively, while S—H⋯O interactions in L-cysteine-III are depicted as green dotted lines. For clarity, all C—H⋯O and S⋯O interactions are drawn only in the top left quadrant. Colour scheme: yellow S, blue N, red O, grey C and dark grey H.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 62| Part 2| March 2006| Pages 296-309

doi:10.1107/S0108768105038802

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