Medidas de espalhamento Raman em cristais de a-glicina a baixas temperaturas

Abstract

Glycine (C2H5NO2) is the only protein amino acid aquiral. At normal conditions of temperature and pressure there are three polymorphic forms: α, β and λ. In this work were grown single crystals of α-glycine by the slow evaporation method. To confirm the structure were performed X-ray diffraction experiments. At room temperature it was recorded the Raman spectra in order to classify tentatively the vibrational modes of the crystal. Additionally low-temperature measurements were also performed to investigate the stability of the crystalline structure of α-glycine. Modifications in the spectra show that the α-glycine molecules underwent conformational changes at low temperature.