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, Universidade Federal do Piau\'i)
TL;DR
This study investigates the low-temperature vibrational properties of L-histidine crystals using Raman spectroscopy, revealing a phase transition at 165 K supported by calorimetry data.
Contribution
It provides new insights into the conformational phase transition of L-histidine crystals through combined Raman and calorimetry analysis.
Findings
Discontinuities in Raman spectra at 165 K indicating a phase transition
Modification of bonds in NH3+ and CO2- groups during transition
Calorimetry confirms an enthalpic anomaly at 165 K
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.
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