Journal
BRAZILIAN JOURNAL OF PHYSICS
Volume 43, Issue 3, Pages 137-144Publisher
SPRINGER
DOI: 10.1007/s13538-013-0132-3
Keywords
Amino acid; Phase transition; Low temperature
Categories
Funding
- CNPq
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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 is provided by differential scanning calorimetry measurements, which identified an enthalpic anomaly at similar to 165 K.
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