High-pressure Raman spectra of racemate dl-alanine crystals
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High-pressure Raman spectra of racemate dl-alanine crystals. / Belo, E. A.; Lima, J. A.; Freire, P. T.C.; Melo, F. E.A.; Filho, J. Mendes; Bordallo, H. N.; Polian, A.
I: Vibrational Spectroscopy, Bind 54, Nr. 2, 18.11.2010, s. 107-111.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - High-pressure Raman spectra of racemate dl-alanine crystals
AU - Belo, E. A.
AU - Lima, J. A.
AU - Freire, P. T.C.
AU - Melo, F. E.A.
AU - Filho, J. Mendes
AU - Bordallo, H. N.
AU - Polian, A.
PY - 2010/11/18
Y1 - 2010/11/18
N2 - Raman spectroscopy investigations of dl-alanine crystal under high pressures have been carried out up to 18.0 GPa. For instance, around 1.0 GPa and between 1.7 and 2.3 GPa changes in the Raman profile were observed and associated to conformational changes of the molecules in the unit cell or to a phase transition accompanied to slight conformational change of the molecule through CH and CH3 groups. Moreover, between 6.0 and 7.3 GPa, the appearance of a new low energy lattice modes and to the splitting of a band assigned to the stretching vibration of the CCH3 moiety were related to a second phase transition. Finally, changes in lattice modes, red shift of the band associated to CCH3 stretching and increasing of line-width of the band associated to the wagging of CO2, between 11.6 and 13.2 GPa, are ascribed to a third phase transition. On release of pressure the original phase was obtained again.
AB - Raman spectroscopy investigations of dl-alanine crystal under high pressures have been carried out up to 18.0 GPa. For instance, around 1.0 GPa and between 1.7 and 2.3 GPa changes in the Raman profile were observed and associated to conformational changes of the molecules in the unit cell or to a phase transition accompanied to slight conformational change of the molecule through CH and CH3 groups. Moreover, between 6.0 and 7.3 GPa, the appearance of a new low energy lattice modes and to the splitting of a band assigned to the stretching vibration of the CCH3 moiety were related to a second phase transition. Finally, changes in lattice modes, red shift of the band associated to CCH3 stretching and increasing of line-width of the band associated to the wagging of CO2, between 11.6 and 13.2 GPa, are ascribed to a third phase transition. On release of pressure the original phase was obtained again.
KW - High pressure
KW - Organic crystals
KW - Phonons
UR - http://www.scopus.com/inward/record.url?scp=78649977993&partnerID=8YFLogxK
U2 - 10.1016/j.vibspec.2010.03.016
DO - 10.1016/j.vibspec.2010.03.016
M3 - Journal article
AN - SCOPUS:78649977993
VL - 54
SP - 107
EP - 111
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
SN - 0003-2670
IS - 2
ER -
ID: 199167725