Abstract
Abstract The reaction of sulfur dioxide with excess ammonia was studied during warm-up of rare gas matrices and in sealed pressure tubes containing various isotropic species. In the matrix experiments six IR bands belonging to ammonium thionylimide, NH4: NSO, were observed in the temperature range between 40°K and 90°K. Above 80°K the spectrum of ammonium sulfite, NH4SO3 prevails. In sealed tubes containing liquid ammonia at room temperature several step-wise reactions can be followed. They consist of ammonolysis of SO2, followed by auto-redox disproportionation of SIV into a range of oxidation states. Raman spectra show the presence of sulfate, dithionate, thiosulfate, and the polythionates. Isotope substitution indicates that ammonia does not participate in redox reactions and acts merely as a nucleophilic catalyst. The composition of the samples changes over a period of at least 2 years. In some tubes with NH3:SO2 <7 a spontaneous reaction occurs after 1 ½ to 2 years and the colorless or pale yellow so...
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