Abstract The vibrational properties of the nucleoside deoxyadenosine monohydrate were investigated with Raman spectroscopy in the crystal form of the material. A tentative assignment of the vibrational modes was made through the knowledge of vibrations in similar materials. The behavior of the crystal under high pressure was investigated up to 5.6 GPa. The results suggest a phase transition undergone by the crystal between 0.6 at 0.8 GPa as indicated by discontinuities on the wavenumber of some modes and changes in the Raman spectra. The phase transition involved a hydrogen bond between the sugar and the water molecule as it is observed through the changes of a COH bending vibration. Above the pressure of the phase transition, it is observed that the vibrational modes continue to change continuously up to the highest pressure reached in the experiment. Finally, the phase transition appears as completely reversible.

中文翻译：

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高压下研究核苷脱氧腺苷一水合物的振动模式

摘要 利用拉曼光谱研究了核苷脱氧腺苷一水合物的振动特性。通过对类似材料振动的了解，对振动模式进行了初步分配。在高达 5.6 GPa 的高压下研究了晶体的行为。结果表明晶体在 0.8 GPa 下经历了 0.6 之间的相变，如某些模式波数的不连续性和拉曼光谱的变化所示。相变涉及糖和水分子之间的氢键，因为它是通过 COH 弯曲振动的变化观察到的。在相变压力之上，观察到振动模式持续变化直到实验中达到的最高压力。最后，相变看起来是完全可逆的。