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 9
Staggered [R_4^4(16)]

ring motifs in (a) L-cysteine-I at 1.8 GPa and (b) L-cysteine-III at 2.6 GPa. Red and black planes represent the best plane through N1⋯O1 atoms in adjacent [R_4^4(16)]

ring motifs. Note the reduction in angle between the planes from 72.8 (3)° in (a), to 41.6 (3)° in (b).

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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