Polarized Raman Spectra and Infrared Analysis of Vibrational Modes in L-Threonine Crystals

Silva, B. L.; Freire, Paulo; Melo, F. E. A.; Guedes, I.; Silva, M. A. Araújo; Fílho, J. Mendes; Moreno, A. J. D.

doi:10.1590/s0103-97331998000100003

Cited by 58 publications

(24 citation statements)

References 5 publications

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“…The C-O-H torsion wavenumber is observed as a strong, broad band at 764 cm 1 in the Raman (z) and 756 cm 1 in the IR (Z) spectra. This is in good agreement with the result of Silva et al 19 …”

Section: C-o(h) Stretching Wavenumberssupporting

confidence: 94%

Raman and infrared spectral studies of DL‐threoninium dihydrogenphosphate

Ravikumar¹,

Ramaswamy²,

Jinnah³

et al. 2004

J Raman Spectroscopy

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Infrared and Raman spectra of DL-threoninium dihydrogenphosphate crystal were recorded at room temperature and vibrational assignments of the observed wavenumbers were made. The extensive intermolecular hydrogen bonding in the crystal was identified by the shifting of bands due to the stretching and bending modes of the various functional groups. The T d symmetry of the phosphate anion is reduced to the lower symmetry C 2v owing to the intermolecular hydrogen bonding and coordination. The splitting of degenerate modes and the appearance of infrared-inactive modes indicate the effect of the crystalline field on molecular vibrations.

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Section: C-o(h) Stretching Wavenumberssupporting

confidence: 94%

Raman and infrared spectral studies of DL‐threoninium dihydrogenphosphate

Ravikumar¹,

Ramaswamy²,

Jinnah³

et al. 2004

J Raman Spectroscopy

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“…For organic crystals the region about 3000 cm −1 , in general, contains the bands originated from CH, CH 2 , CH 3 , and NH vibrations [17,18]. For some materials this region condenses very important informations, being a tool to understand conformation of the molecules in the unit cell or even interactions such hydrogen bonds.…”

Section: Resultsmentioning

confidence: 99%

Comparative vibrational spectra of pilosine and epiisopilosine crystals

et al. 2010

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This paper describes the study of two alkaloids extracted from Pilocarpus Microphyllus (Rutaceae): pilosine and epiisopilosine. These substances have potential application in the treatment of several diseases. In this work FT-Raman and the FT-IR spectra of pilosine and epiisopilosine were investigated at 300 K. Vibrational wavenumber and wave vector have been predicted using density functional theory (B3LYP) calculations with the 6-31 G(d,p) basis set. A comparison with experiment, allowed us to assign most of the normal modes of the crystals.

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“…The very intense band at 541 cm 1 is assigned as the rocking of CO 2 , r(CO 2 ); this vibration also gives rise to intense bands in other amino acid crystals such as L-alanine 9 and L-threonine. 10 The band observed at 665 cm 1 was assigned 11 as a bending mode of CO 2 . Figure 3 presents the Raman spectra of L-valine in the region 750-1350 cm 1 .…”

Section: Resultsmentioning

confidence: 99%

Raman scattering ofL-valine crystals

Lima

Freire

Lima

et al. 2005

J. Raman Spectrosc.

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Single crystals of L-valine, C 5 H 11 O 2 N, have been studied by Raman spectroscopy at temperatures from 17 to 300 K over the spectral range 20-3300 cm −1 . A tentative assignment of the bands is given. Careful analysis of the Raman spectra suggests that a series of changes in the low-wavenumber region may be associated with a phase transition undergone by the material, and this possibility is discussed.

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Polarized Raman Spectra and Infrared Analysis of Vibrational Modes in L-Threonine Crystals

Cited by 58 publications

References 5 publications

Raman and infrared spectral studies of DL‐threoninium dihydrogenphosphate

Raman and infrared spectral studies of DL‐threoninium dihydrogenphosphate

Comparative vibrational spectra of pilosine and epiisopilosine crystals

Raman scattering ofL-valine crystals

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