Combined X-ray diffraction and Raman spectroscopy studies of phase transitions in crystalline amino acids at low temperatures and high pressures: selected examples

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Crystalline amino acids are interesting as molecular materials, drugs, and biomimetics. The advantage of complementing diffraction and Raman spectroscopy studies for achieving a better understanding of the interrelation between the intramolecular motions and the distortions of the intermolecular hydrogen-bond networks is illustrated at several selected examples of low-temperature and high-pressure phase transitions in the β- and γ-polymorphs of glycine, L-serine, L- and DL-cysteine.