Terahertz spectra of l-phenylalanine and its monohydrate.

Abstract

The low-frequency vibrational property of l-phenylalanine (l-Phe) and l-phenylalanine monohydrate (l-Phe·H2O) has been investigated by terahertz time-domain spectroscopy (THz-TDS) at room and low temperature ranging from 0.5 to 4.5THz. Distinctive THz absorption spectra of the two compounds were observed. Density functional theory (DFT) calculations based on the crystal structures have been performed to simulate the vibrational modes of l-Phe and l-Phe·H2O and the results agree well with the experimental observations. The study indicates that the characterized features of l-Phe mainly originate from the collective vibration of molecules. And the characterized features of l-Phe·H2O mainly come from hydrogen bond interactions between l-Phe and water molecules. l-Phe and l-Phe·H2O were also verified by differential scanning calorimetry and thermogravimetry (DSC-TG) and powder X-ray diffraction (PXRD) examinations.

DOI: 10.1016/j.saa.2017.01.050

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Cite this paper

@article{Pan2017TerahertzSO, title={Terahertz spectra of l-phenylalanine and its monohydrate.}, author={Tingting Pan and Shaoping Li and Tao Zou and Zheng Yu and Bo Zhang and Chenyang Wang and Jianbing Zhang and Mingxia He and Hongwei Zhao}, journal={Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy}, year={2017}, volume={178}, pages={19-23} }