High-pressure crystal structure of <i>n</i> -hexylamine

A primary amine, n-hexylamine (HA, C₆H₁₅N), has been studied at high pressure by single-crystal X-ray diffraction. The structure of this compound has been determined, at ambient temperature, from the freezing pressure up to 1.40 GPa. HA at high pressure crystallizes in the space group Pca2₁, which was already found at ambient pressure and low temperature. The compressibility of the N-H...N hydrogen bonds has been compared with that of the shortest C-H...N and H...H intermolecular distances, revealing that the H...H distances exhibit the highest degree of compressibility among them.