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A new polymorphic form of the synthetic antioxidant propyl gallate was obtained by the recrystallization of the compound in acetone. The new form was characterized by thermogravimetry, differential scanning calorimetry, X-ray powder diffractometry, and near-and middle-infrared region spectroscopy. While the commercial form of propyl gallate starts to melt at 145°C with the maximum temperature of the peak at 150°C, the recrystallized form starts to melt at 140°C with the maximum temperature of the peak at 148.8°C. The two forms differ much in the X-ray powder diffractograms pattern, confirming the change in the longdistance interactions in both forms but the near-and middleinfrared region spectroscopy shows that no difference occurs in the inter-and intramolecular interactions.

A new lithium salt was synthesized and characterized. The stoichiometry of the salt was LiNap . 1H 2 O. The salt was thermally stable until 260 °C and 275 °C in air and nitrogen atmospheres, respectively, and did not melt until decomposition. The salt was highly crystalline and the crystal had a prismatic form. A spectroscopic study of the compound was performed, which covered the UV, Vis, NIR and MIR regions. The fluorescence studies showed that the salt emitted at 356 nm when excited at 236 or 264 nm. This emission was assigned to the first singlet excited state to the singlet ground level state of the compound.