A new type of the dinitrogen pentoxide–acid interaction

Dinitrogen pentoxide solution in trifluoroacetic acid simultaneously has features of both known types of its interaction with acids, viz. with weak and strong acids. It partially reacts with CF₃COOH to give the covalent trifluoroacetyl nitrate and nitric acid, however the major part of N₂O₅ exists in the covalent form in solution to concurrently produce nitronium ions due to the presence of HNO₃. Quantum chemical calculations confirm the equilibrium nature of CF₃COOHN₂O₅ interaction.