Effect of pressure on crystalline l- and dl-serine: Revisited by a combined single-crystal X-ray diffraction at a laboratory source and polarized Raman spectroscopy study

摘要

Information on the effect of pressure on hydrogen bonds, which could be derived from single-crystal X-ray diffraction at a laboratory source and polarized Raman spectroscopy, has been compared. l-Serine and dl-serine were selected for this case study. The role of hydrogen bonds in pressure-induced phase transitions in the first system and in the structural stability of the second one are discussed. Non-monotonic distortion of selected hydrogen bonds in the pressure range below 1-2 GPa, a change in the compression mechanism at 2-3 GPa, and the evidence of formation of bifurcated N - H?O hydrogen bonds in dl-serine at 3-4 GPa are considered.