Effect of pressure on the crystal structure of α-glycylglycine to 4.7 GPa; application of Hirshfeld surfaces to analyse contacts on increasing pressure

Moggach, S.A.; Allan, D.R.; Parsons, S.; Sawyer, L.

doi:10.1107/S0108768105042072

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

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Figure 2
Ball-and-stick model showing (a) R₂²(10) and R₄⁴(18) ring motifs forming layers within α-GLYGLY. The layers formed within the structure are also reminiscent of those of an antiparallel β sheet motif (b). Hydrogen bonds are drawn as black dotted lines, while weak C=O⋯C=O interactions are shown, only in (a), as pink dotted lines. The second largest component of the strain tensor is drawn as a red arrow in (a). Space-filling plots for (c) α-GLYGLY at ambient pressure and (d) at 4.7 GPa are shown. (a), (c) and (d) are viewed perpendicular to the (10 $[\overline 1]$ ) plane. Note that voids in R₄⁴(18) and R₂²(10) ring motifs close up on increasing pressure. Colour scheme: N blue, C grey, O red and H white.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 62| Part 2| March 2006| Pages 310-320

doi:10.1107/S0108768105042072

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