We have obtained the Raman spectra of DL-leucine crystal through a
diamond anvil cell for pressures between 0 and 5 GPa. The observation of
several anomalies in the regions of both the lattice mode and the
internal mode suggests that the crystal undergoes a phase transition
between 2.4 and 3.2 GPa. This phase transition is preceded by a gradual
change of the molecular conformation of leucine molecules in the unit
cell. We show that, up to 5 GPa, the DL-leucine crystal is more stable
than the chiral L-leucine crystal because while the former presents only
one phase transition in the 2.4-3.2 GPa interval, the latter presents
three different transitions, the first of which is observed at 0.46 GPa.
Additionally, when pressure is released to 0.0 GPa, the original Raman
spectrum is recovered, indicating that the modification at high pressure
on DL-leucine crystal is reversible. (C) 2013 Elsevier B.V. All rights
reserved.
%0 Journal Article
%1 WOS:000319097100015
%A Abagaro, B T O
%A Freire, P T C
%A Silva, J G
%A Melo, F E A
%A Jr., J A Lima
%A Filho, J Mendes
%A Pizani, P S
%C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
%D 2013
%I ELSEVIER SCIENCE BV
%J VIBRATIONAL SPECTROSCOPY
%K Crystal High and crystal; pressure} structure symmetry; {Organic
%P 119-122
%R 10.1016/j.vibspec.2013.03.001
%T High pressure Raman scattering of DL-leucine crystals
%V 66
%X We have obtained the Raman spectra of DL-leucine crystal through a
diamond anvil cell for pressures between 0 and 5 GPa. The observation of
several anomalies in the regions of both the lattice mode and the
internal mode suggests that the crystal undergoes a phase transition
between 2.4 and 3.2 GPa. This phase transition is preceded by a gradual
change of the molecular conformation of leucine molecules in the unit
cell. We show that, up to 5 GPa, the DL-leucine crystal is more stable
than the chiral L-leucine crystal because while the former presents only
one phase transition in the 2.4-3.2 GPa interval, the latter presents
three different transitions, the first of which is observed at 0.46 GPa.
Additionally, when pressure is released to 0.0 GPa, the original Raman
spectrum is recovered, indicating that the modification at high pressure
on DL-leucine crystal is reversible. (C) 2013 Elsevier B.V. All rights
reserved.
@article{WOS:000319097100015,
abstract = {We have obtained the Raman spectra of DL-leucine crystal through a
diamond anvil cell for pressures between 0 and 5 GPa. The observation of
several anomalies in the regions of both the lattice mode and the
internal mode suggests that the crystal undergoes a phase transition
between 2.4 and 3.2 GPa. This phase transition is preceded by a gradual
change of the molecular conformation of leucine molecules in the unit
cell. We show that, up to 5 GPa, the DL-leucine crystal is more stable
than the chiral L-leucine crystal because while the former presents only
one phase transition in the 2.4-3.2 GPa interval, the latter presents
three different transitions, the first of which is observed at 0.46 GPa.
Additionally, when pressure is released to 0.0 GPa, the original Raman
spectrum is recovered, indicating that the modification at high pressure
on DL-leucine crystal is reversible. (C) 2013 Elsevier B.V. All rights
reserved.},
added-at = {2022-05-23T20:00:14.000+0200},
address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
author = {Abagaro, B T O and Freire, P T C and Silva, J G and Melo, F E A and Jr., J A Lima and Filho, J Mendes and Pizani, P S},
biburl = {https://www.bibsonomy.org/bibtex/29d3d941fd9347e18ec4663fd7a7d4e5f/ppgfis_ufc_br},
doi = {10.1016/j.vibspec.2013.03.001},
interhash = {d48cac7cbb7f315bdc5b54896760f897},
intrahash = {9d3d941fd9347e18ec4663fd7a7d4e5f},
issn = {0924-2031},
journal = {VIBRATIONAL SPECTROSCOPY},
keywords = {Crystal High and crystal; pressure} structure symmetry; {Organic},
pages = {119-122},
publisher = {ELSEVIER SCIENCE BV},
pubstate = {published},
timestamp = {2022-05-23T20:00:14.000+0200},
title = {High pressure Raman scattering of DL-leucine crystals},
tppubtype = {article},
volume = 66,
year = 2013
}