New pressure-induced phase transitions of l-threonine crystal: A Raman spectroscopic study

• l-threonine crystals were grown by slow evaporation methods.
• Raman spectra of l-threonine.
• Structural phase transition under pressure.
• Modifications on hydrogen bonds.

l-threonine crystal was studied by Raman spectroscopy under pressure in the spectral range from 50 to 3300 cm−1. The pressure range of a previous study has been extended from 4 to 27.0 GPa. Modifications in the whole spectrum give us evidence of three structural phase transitions undergone by this amino acid as well as two conformational change. The classification of the vibrational modes and the behavior of their frequencies as a function of the pressure are presented.

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