Low-temperature Raman spectra of L-histidine crystal

(2) Departamento de F\'isica; Campus Ministro Petr\^onio Portella; C. L. Lima (2) ((1) Departamento de F\'isica; F. E. A. Melo (1); G. P. De Sousa (1); J. Mendes Filho (1); P. T. C. Freire (1); Universidade Federal do Cear\'a; Universidade Federal do Piau\'i)

arxiv: 1304.7692 · v1 · pith:KDKCWSDDnew · submitted 2013-04-26 · ⚛️ physics.chem-ph · cond-mat.mtrl-sci

Low-temperature Raman spectra of L-histidine crystal

G. P. De Sousa (1) , P. T. C. Freire (1) , J. Mendes Filho (1) , F. E. A. Melo (1) , C. L. Lima (2) ((1) Departamento de F\'isica , Universidade Federal do Cear\'a , (2) Departamento de F\'isica , Campus Ministro Petr\^onio Portella

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Universidade Federal do Piau\'i)

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classification ⚛️ physics.chem-ph cond-mat.mtrl-sci

keywords bondsl-histidinephaseramanspectratransitionadditionalanomaly

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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.

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Low-temperature Raman spectra of L-histidine crystal

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