Figure 4
Structures of HA at low-temperature (Maloney et al., 2014 ) and high-pressure conditions: (a) 0.1 MPa/150 K and (b) 1.40 GPa/295 K. Four hydrogen bonds (N—H⋯N) and one short intermolecular H⋯H distance at the end of the carbon chains are marked with dashed lines (distances are indicated). The intermolecular space accessible to a probe with a radius of 0.7 Å and a grid spacing of 0.1 Å (Macrae et al., 2020 ) is indicated in yellow. |