L-组氨酸晶体的低温拉曼光谱
Low-temperature Raman spectra of L-histidine crystal
摘要：
我们提出了一个拉曼光谱研究的振动性质的L-组氨酸晶体在低温下。的光谱的温度依赖性显示在165 K，我们确定与修改相关的NH3+和CO2-基序的构象相变，改变分子间的键的键的不连续性。这种相变的额外证据是通过差示扫描量热法测量提供的，其确定了在~165 K处的反常相变。
英文摘要：
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 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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