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Figure 5
Inter­molecular H⋯N and H⋯H distances (Å) observed in HA structures plotted as a function of pressure. The two shortest distances for each type are presented: blue circles represent the N—H⋯N and blue squares depict the C—H⋯N hy­dro­gen–acceptor (H⋯A) distances, while red triangles represent inter­molecular H⋯H distances. Blue and red horizontal lines show the sum of the van der Waals radii of H and N of 2.75 Å, and of two H atoms of 2.40 Å (Bondi, 1964BB4). The estimated standard deviations are smaller than the plotted symbols.

Journal logo STRUCTURAL
CHEMISTRY
ISSN: 2053-2296
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