Low-wavenumber Raman spectra of l-tyrosine, l-tyrosine hydrochloride, and l-tyrosine hydrobromide (cas 111317-60-3) crystals at high temperatures

Add time:08/29/2019    Source:sciencedirect.com

Crystals of l-tyrosine and semiorganic l-tyrosine hydrochloride and l-tyrosine hydrobromide (cas 111317-60-3), known for their nonlinear optical properties, were studied by Raman spectroscopy in the temperature range from 298 to 453 K. Hydrogen bonding at room temperature and thermal decomposition are correlated with Raman bands in the low-wavenumber region at approximately 120 cm−1. The detailed analysis of these bands and the temperature dependence of their wavenumbers show an interesting correlation between hydrogen bonds, vibrational properties, and thermal decomposition. In particular, we note a correlation between the lengths of the N–H … X bonds and the wavenumber of a low-wavenumber band and that the introduction of Br and Cl in the l-tyrosine hydrochloride and l-tyrosine hydrobromide structures does not substantially modify the O–H⋯O bonds when compared with the l-tyrosine crystal. Additionally, the hydrophobic character of the interactions apparently does not change during heating, and there is no evidence for the breakdown of the hydrophobic interactions.

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