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 7
Superposition of the [R_4^4(16)]

ring motifs of L-cysteine-I at ambient pressure (black) and 1.8 GPa (red). N—H⋯O hydrogen bonds are drawn as black dotted lines. Note the sliding movement of the layers that comprise the ring motifs over each other and a shortening of the C1—H3⋯O1 contact (orange dotted line) on increasing pressure as a result.

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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