Low-temperature Raman spectra of racemate DL-Alanine crystals

J. A. Lima; P. T.C. Freire; F. E.A. Melo; J. Mendes Filho; G. P. de Sousa; R. J.C. Lima; P. F. Façanha Filho; H. N. Bordallo

doi:10.1002/jrs.2507

Low-temperature Raman spectra of racemate DL-Alanine crystals

J. A. Lima, P. T.C. Freire, F. E.A. Melo, J. Mendes Filho, G. P. de Sousa, R. J.C. Lima, P. F. Façanha Filho, H. N. Bordallo

14 Citations (Scopus)

Abstract

Raman spectra of DL-Alanine crystals were investigated in the 50-3200cm^-1 spectral region for temperatures ranging from 15 to 295 K. The crystalline structure of DL-Alanine represents a rare example of an amino acid racemate crystallizing in a non-centrosymmetric space group. From this study, we have observed changes in the wavenumber of modes associated with both rocking of CO₂^- and skeletal vibrations. On the other hand, neither changes in the modes associated to CH or CH₃ vibrations nor substantial modifications of the lattice modes of the crystal were observed. Such result indicates slight changes of the CO₂ group orientation without observation of a solid-solid phase transition in the DL-Alanine crystal.

Original language	English
Journal	Journal of Raman Spectroscopy
Volume	41
Issue number	7
Pages (from-to)	808-813
Number of pages	6
ISSN	0377-0486
DOIs	https://doi.org/10.1002/jrs.2507
Publication status	Published - 1 Jul 2010

Keywords

Amino acid
Hydrogen bond
Low temperature

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title = "Low-temperature Raman spectra of racemate DL-Alanine crystals",

abstract = "Raman spectra of DL-Alanine crystals were investigated in the 50-3200cm-1 spectral region for temperatures ranging from 15 to 295 K. The crystalline structure of DL-Alanine represents a rare example of an amino acid racemate crystallizing in a non-centrosymmetric space group. From this study, we have observed changes in the wavenumber of modes associated with both rocking of CO2- and skeletal vibrations. On the other hand, neither changes in the modes associated to CH or CH3 vibrations nor substantial modifications of the lattice modes of the crystal were observed. Such result indicates slight changes of the CO2 group orientation without observation of a solid-solid phase transition in the DL-Alanine crystal.",

keywords = "Amino acid, Hydrogen bond, Low temperature",

author = "Lima, {J. A.} and Freire, {P. T.C.} and Melo, {F. E.A.} and {Mendes Filho}, J. and {de Sousa}, {G. P.} and Lima, {R. J.C.} and {Fa{\c c}anha Filho}, {P. F.} and Bordallo, {H. N.}",

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T1 - Low-temperature Raman spectra of racemate DL-Alanine crystals

AU - Lima, J. A.

AU - Freire, P. T.C.

AU - Melo, F. E.A.

AU - Mendes Filho, J.

AU - de Sousa, G. P.

AU - Lima, R. J.C.

AU - Façanha Filho, P. F.

AU - Bordallo, H. N.

PY - 2010/7/1

Y1 - 2010/7/1

N2 - Raman spectra of DL-Alanine crystals were investigated in the 50-3200cm-1 spectral region for temperatures ranging from 15 to 295 K. The crystalline structure of DL-Alanine represents a rare example of an amino acid racemate crystallizing in a non-centrosymmetric space group. From this study, we have observed changes in the wavenumber of modes associated with both rocking of CO2- and skeletal vibrations. On the other hand, neither changes in the modes associated to CH or CH3 vibrations nor substantial modifications of the lattice modes of the crystal were observed. Such result indicates slight changes of the CO2 group orientation without observation of a solid-solid phase transition in the DL-Alanine crystal.

AB - Raman spectra of DL-Alanine crystals were investigated in the 50-3200cm-1 spectral region for temperatures ranging from 15 to 295 K. The crystalline structure of DL-Alanine represents a rare example of an amino acid racemate crystallizing in a non-centrosymmetric space group. From this study, we have observed changes in the wavenumber of modes associated with both rocking of CO2- and skeletal vibrations. On the other hand, neither changes in the modes associated to CH or CH3 vibrations nor substantial modifications of the lattice modes of the crystal were observed. Such result indicates slight changes of the CO2 group orientation without observation of a solid-solid phase transition in the DL-Alanine crystal.

KW - Amino acid

KW - Hydrogen bond

KW - Low temperature

U2 - 10.1002/jrs.2507

DO - 10.1002/jrs.2507

M3 - Journal article

AN - SCOPUS:77954972508

SN - 0377-0486

VL - 41

SP - 808

EP - 813

JO - Journal of Raman Spectroscopy

JF - Journal of Raman Spectroscopy

IS - 7

ER -

Low-temperature Raman spectra of racemate DL-Alanine crystals

Abstract

Keywords

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