Low-temperature Raman spectra of L-histidine crystal

G. P. De Sousa; P. T. C. Freire; J. Mendes Filho; F. E. A. Melo; C. L. Lima

doi:10.1007/s13538-013-0132-3

Low-temperature Raman spectra of L-histidine crystal

Chemical Physics 2015-06-15 v1 Materials Science

Authors: G. P. De Sousa , P. T. C. Freire , J. Mendes Filho , F. E. A. Melo , C. L. Lima

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Abstract

We present a Raman spectroscopy investigation of the vibrational properties of L-histidine crystals at low temperatures. The temperature dependence of the spectra show discontinuities at 165 K, which we identify with modifications in the bonds associated to both the NH3+ and CO2- motifs indicative of a conformational phase transition that changes the intermolecular bonds. Additional evidence of such a phase transition was provided by differential scanning calorimetry measurements, which identified an enthalpic anomaly at ~165 K.

Keywords

Raman spectroscopy L-histidine crystal low temperature phase transition vibrational properties differential scanning calorimetry

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@article{arxiv.1304.7692,
  title  = {Low-temperature Raman spectra of L-histidine crystal},
  author = {G. P. De Sousa and P. T. C. Freire and J. Mendes Filho and F. E. A. Melo and C. L. Lima},
  journal= {arXiv preprint arXiv:1304.7692},
  year   = {2015}
}

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18 pages, 5 figures and 1 table, Brazilian Journal of Physics, 2013

Low-temperature Raman spectra of L-histidine crystal

Abstract

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