Using Raman spectroscopy to understand the origin of the phase transition observed in the crystalline sulfur based amino acid l-methionine
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- L MET VibSpect 2013
Submitted manuscript, 1.22 MB, PDF document
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.
Original language | English |
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Journal | Vibrational Spectroscopy |
Volume | 65 |
Issue number | March |
Pages (from-to) | 132 |
Number of pages | 141 |
ISSN | 0924-2031 |
DOIs | |
Publication status | Published - 2013 |
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