Low-temperature Raman spectra of racemate DL-Alanine crystals

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • 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
  • Nunes Bordallo, Heloisa

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.

OriginalsprogEngelsk
TidsskriftJournal of Raman Spectroscopy
Vol/bind41
Udgave nummer7
Sider (fra-til)808-813
Antal sider6
ISSN0377-0486
DOI
StatusUdgivet - 1 jul. 2010

ID: 199167942