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Terahertz Spectra of L-Phenylalanine and Its Monohydrate

Terahertz Spectra of L-Phenylalanine and Its Monohydrate

Tingting Pan, Shaoping Li, Tao Zou, Zheng Yu, Bo Zhang, Chenyang Wang, Jianbing Zhang, Mingxia He, Hongwei Zhao

Spectrochim Acta A Mol Biomol Spectrosc. 2017 May 5;178:19-23.

PMID: 28157589

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP287484326	L-Asparagine-15N2 monohydrate		287484-32-6	Price

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