Brønsted acid-base pairs of drugs as dual ionic liquids: NMR ionicity studies

Twenty-eight protic ionic liquids (PILs) have been prepared from Active Pharmaceutical Ingredients (APIs). They have been characterized by TGA, DSC and NMR. An important property of Ionic Liquids (ILs) such as the 'degree of ionicity' has been estimated from quantitative determinations by 1H NMR in DMSO-d6 solutions.