High pressure Raman spectra of d-threonine crystal

High pressure Raman spectra of d-threonine crystal

Raman spectra of d-threonine crystal were recorded for pressures up to 8.5GPa. Modifications in the lattice modes indicate that the crystal undergoes two structural phase transitions, the first in the 1.9–2.4GPa pressure range and the second in the 5.1–6.0GPa pressure range. Splitting of modes and c...

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Veröffentlicht in:Vibrational spectroscopy 2013-07, Vol.67, p.1-5
Hauptverfasser: Holanda, R.O., Freire, P.T.C., Silva, J.A.F., Melo, F.E.A., Filho, J. Mendes, Lima, J.A.
Format: Artikel
Sprache:eng
Schlagworte:
Bands
Conformational changes
Crystal structure
Crystals
d-Threonine
High-pressure
Lattice vibration
Lattices
Phase transition
Raman scattering
Raman spectra
Spectroscopy
Splitting
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Zusammenfassung:Raman spectra of d-threonine crystal were recorded for pressures up to 8.5GPa. Modifications in the lattice modes indicate that the crystal undergoes two structural phase transitions, the first in the 1.9–2.4GPa pressure range and the second in the 5.1–6.0GPa pressure range. Splitting of modes and changes in the intensity of several bands suggest a conformational reorientation of the molecule in the crystal framework between 3.5 and 4.3GPa. We discussed ours results by comparing with previous high-pressure investigation on l-conformer.
ISSN:0924-2031
1873-3697
DOI:10.1016/j.vibspec.2013.03.003