TY - JOUR
T1 - Using Raman spectroscopy to understand the origin of the phase transition observed in the crystalline sulfur based amino acid l-methionine
AU - Lima, José A.
AU - Freire, P.T.C.
AU - Melo, F.E.A.
AU - Mendes-Filho, J.
AU - Fischer, Jennifer
AU - Havenith, Remco W.A.
AU - Broer, R.
AU - Bordallo, Heloisa N.
PY - 2013
Y1 - 2013
N2 - We present the Raman spectra of l-methionine (C5 H11 NO2 S) monocrystals obtained in the spectral region ranging from 3200 to 50 cm-1 at temperatures from 20 to 375 K. We investigated the dynamics of the different functional groups in l-methionine and related their behaviour to the structural transition pre- viously reported at about 307 K. Additionally, on cooling, changes in the intensities of some Raman bands were associated with conformational changes of at least one of the two l-methionine conformers in the monoclinic unit cell in the interval 160–140 K. Thermal analysis and DFT calculations provide further support to the interpretation of the Raman results.
AB - We present the Raman spectra of l-methionine (C5 H11 NO2 S) monocrystals obtained in the spectral region ranging from 3200 to 50 cm-1 at temperatures from 20 to 375 K. We investigated the dynamics of the different functional groups in l-methionine and related their behaviour to the structural transition pre- viously reported at about 307 K. Additionally, on cooling, changes in the intensities of some Raman bands were associated with conformational changes of at least one of the two l-methionine conformers in the monoclinic unit cell in the interval 160–140 K. Thermal analysis and DFT calculations provide further support to the interpretation of the Raman results.
U2 - 10.1016/j.vibspec.2012.12.004
DO - 10.1016/j.vibspec.2012.12.004
M3 - Journal article
SN - 0924-2031
VL - 65
SP - 132
JO - Vibrational Spectroscopy
JF - Vibrational Spectroscopy
IS - March
ER -