Pressure-induced phase transitions in l-alanine, revisited

N. A. Tumanov, E. V. Boldyreva, B. A. Kolesov, A. V. Kurnosov, R. Quesada Cabrera

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The effect of pressure on l-alanine has been studied by X-ray powder diffraction (up to 12.3 GPa), single-crystal X-ray diffraction, Raman spectroscopy and optical microscopy (up to ∼6 GPa). No structural phase transitions have been observed. At ∼2 GPa the cell parameters a and b become accidentally equal to each other, but without a change in space-group symmetry. Neither of two transitions reported by others (to a tetragonal phase at ∼2 GPa and to a monoclinic phase at ∼9 GPa) was observed. The changes in cell parameters were continuous up to the highest measured pressures and the cells remained orthorhombic. Some important changes in the intermolecular interactions occur, which also manifest themselves in the Raman spectra. Two new orthorhombic phases could be crystallized from a MeOH/EtOH/H2O pressure-transmitting mixture in the pressure range 0.8-4.7 GPa, but only if the sample was kept at these pressures for at least 1-2 d. The new phases converted back to l-alanine on decompression. Judging from the Raman spectra and cell parameters, the new phases are most probably not l-alanine but its solvates.

langue originaleAnglais
Pages (de - à)458-471
Nombre de pages14
journalActa Crystallographica. Section B: Structural Science
Volume66
Numéro de publication4
Les DOIs
étatPublié - 2010
Modification externeOui

Empreinte digitale

Phase Transition
Alanine
Phase transitions
Pressure
X-Ray Diffraction
Raman scattering
Powder Diffraction
Raman Spectrum Analysis
Decompression
X ray powder diffraction
Optical microscopy
Raman spectroscopy
Microscopy
Single crystals
X ray diffraction

Citer ceci

Tumanov, N. A. ; Boldyreva, E. V. ; Kolesov, B. A. ; Kurnosov, A. V. ; Quesada Cabrera, R. / Pressure-induced phase transitions in l-alanine, revisited. Dans: Acta Crystallographica. Section B: Structural Science. 2010 ; Vol 66, Numéro 4. p. 458-471.
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abstract = "The effect of pressure on l-alanine has been studied by X-ray powder diffraction (up to 12.3 GPa), single-crystal X-ray diffraction, Raman spectroscopy and optical microscopy (up to ∼6 GPa). No structural phase transitions have been observed. At ∼2 GPa the cell parameters a and b become accidentally equal to each other, but without a change in space-group symmetry. Neither of two transitions reported by others (to a tetragonal phase at ∼2 GPa and to a monoclinic phase at ∼9 GPa) was observed. The changes in cell parameters were continuous up to the highest measured pressures and the cells remained orthorhombic. Some important changes in the intermolecular interactions occur, which also manifest themselves in the Raman spectra. Two new orthorhombic phases could be crystallized from a MeOH/EtOH/H2O pressure-transmitting mixture in the pressure range 0.8-4.7 GPa, but only if the sample was kept at these pressures for at least 1-2 d. The new phases converted back to l-alanine on decompression. Judging from the Raman spectra and cell parameters, the new phases are most probably not l-alanine but its solvates.",
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Pressure-induced phase transitions in l-alanine, revisited. / Tumanov, N. A.; Boldyreva, E. V.; Kolesov, B. A.; Kurnosov, A. V.; Quesada Cabrera, R.

Dans: Acta Crystallographica. Section B: Structural Science, Vol 66, Numéro 4, 2010, p. 458-471.

Résultats de recherche: Contribution à un journal/une revueArticle

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AU - Quesada Cabrera, R.

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