Abstract

The normal acid salt isopropylammonium tetrafluorohydrogenphthalate ( 3) was prepared and its structure was determined by X-ray crystallography. This salt is stabilized by N–H …O, O–H …O, C–H …O, and N–H …F hydrogen bonds. Compound 3 was characterized by means of solution and solid-state NMR. The ipso-carbons, whose signals are equivalent in solution, could be distinguished in the solid state, thus reflecting the asymmetric nature of 3. With respect to structural features, 3 was compared with salts of different stoichiometry, i.e. the neutral salt bis(isopropylammonium) tetrafluorophthalate ( 1) and the anomalous salt isopropylammonium tetrafluorohydrogenphthalate × tetrafluorophthalic acid ( 2).

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