Infrared and Raman spectroscopy and DFT calculations of DL amino acids: Valine and lysine hydrochloride

Add time:07/29/2019    Source:sciencedirect.com

Single crystals of DL-valine and DL-lysine hydrochloride were grown by slow evaporation method and the crystallographic structure were confirmed by X-ray diffraction experiment and Rietveld method. These two crystals have been studied by Raman spectroscopy in the 25–3600 cm−1 spectral range and by infrared spectroscopy through the interval 375–4000 cm−1 at room temperature. Experimental and theoretical vibrational spectra were compared and a complete analysis of the modes was done in terms of the Potential Energy Distribution (PED).

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