Low-Temperature Raman Spectra of l -Histidine Crystals
BRAZILIAN JOURNAL OF PHYSICS(2013)
摘要
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 NH 3 + and CO 2 − 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 ∼165 K.
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关键词
Amino acid,Phase transition,Low temperature
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