Preparation, characterization and thermolysis of nitrate salt of aminopyridines, Part-85

Recent work has described the preparation and characterization of nitrate salts of 2, 3- and 4-aminopyridines. 3- and 4-Aminopyridine salts were characterized by X-ray crystallography. Thermal and ignition characteristics of these salts were studied by TG, simultaneous TG-DSC and ignition delay measurements. The kinetics of thermal decomposition was evaluated by model fitting and isoconversional methods using isothermal TG data. When subjected to high temperature, these salts undergo exothermic self propagative decomposition reactions leading to ignition. The proton transfer process seems to be the primary step in the thermolysis of these salts. The energy of activation for decomposition (Ea) and ignition (E∗) were found to be linearly related with pKa of the corresponding amine.