Properties of Ammonium Pyridinium Imidobis(sulfate)

Abstract

Chemical properties were investigated for ammonium pyridinium imidobis (sulfate) [1]which was prepared by heating amidosulfuric acid in pyridine at 100°C for 10 min. Unexpectedly [1] was stable and hydrolyzed very slowly at room temperature. Refluxing [1]in pyridine at 115°C for 120 minutes yielded pyridinesulfur trioxide complex and ammonium amidosulfate. In pyridine, amidosulfuric acid and [1] were interconverted:
Prolonged heating of ammonium amidosulfate in pyridine gave diammonium imidobis (sulfate).From these rerults, it was concluded that aquo-ammono-sulfuric acids, including amidosulfuric acid, imidobis (sulfuric) acid, and their ammonium salts, in pyridine were first transformed into the complex salts of the general composition, (NH₃)m (SO₃)n which then rearranged into aquo-ammono-sulfates.