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 3

Ball-and-stick/wire model showing interactions between layers of GLYGLY molecules as viewed (a) perpendicular to the (10 $[\overline 1]$ ) plane. Molecules in the upper and lower layers are coloured red and blue, respectively. R²₃(6) ring motifs between layers of GLYGLY molecules are shown. Black and orange dotted lines represent NH⋯O and CH⋯O hydrogen bonds, respectively, while pink dotted lines represent weak C=O⋯C=O interactions. Space-filling plots of R²₃(6) ring motifs at (b) ambient pressure and (c) 4.7 GPa are shown, drawn at the same scale and direction with only the ammonium and carboxyl groups involved in the formation of the rings shown. The colour scheme is the same as that in Fig. 2

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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