Thermochemical properties of l-alanine nitrate and l-alanine ethyl ester nitrate

Two inorganic derivatives of l-α-alanine, namely alanine nitrate (AlaNO₃) and alanine ethyl ester nitrate (AlaEthNO₃), were synthesized and studied by combustion calorimetry and differential scanning calorimetry (DSC). The enthalpies of combustion and formation in the condensed state, as well as the thermal behavior and stability in the temperature range of 25–250 °C for AlaNO₃ and ?70–250 °C for AlaEthNO₃, were determined. The increasing of the stability of the derivatives compared with that of the alanine was observed. The melting decomposition temperatures and the corresponding enthalpies of transitions were evidenced. FT-IR determinations were used to identify functional groups of the studied compounds. The UV–vis spectral study was carried out to test the optical transmitting property. Additional polarimetric measurements which confirmed the chiral nature of the two nitrates were performed.