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 4
Unit-cell packing motifs in (a) L-cysteine-I at ambient pressure, (b) L-cysteine-III at 2.6 GPa and (c) L-cysteine-IV at 1.7 GPa. Both (a) and (b) are viewed along c, while (c) is viewed along b. Note the sinusoidal appearance of R⁴₄(16) ring motifs along a, as indicated by arrows in (a). NH⋯O, SH⋯S and SH⋯O hydrogen bonds are depicted as black, pink and green dotted lines, respectively.

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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