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 is provided by differential scanning calorimetry
measurements, which identified an enthalpic anomaly at similar to 165 K.
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