Medidas de espalhamento Raman em cristais de L-alanina a baixas temperaturas

Abstract

Alanine (C3H7NO2) is a non-essential protein amino acid. In this study were grown L-alanine crystals by the slow evaporation method of the solvent, which were investigated by Raman spectroscopy measures and they had their structures confirmed by measures of X-ray diffraction. Initial Raman Spectroscopy measurements were performed at room temperature and from these ones we obtained a classification of normal modes of vibration which was based on other work about L-alanine itself and DL-alanine as well. Then, the low-temperature measurements were taken (in a decreasing way until 15 K) in order to study the stability of crystalline samples. The uniformity of all Raman spectra of the L-alanine molecules doesn’t evidence structural phase transition at low temperatures, a conclusion which is also confirmed in other works already done about this aminoacid.