Co-crystals and salts formed from 4-fluorobenzoic acid and heteroaromatic nitrogenous bases

Acridine 4-fluorobenzoic acid (1) and 9-aminoacridinium 4-fluorobenzoate monohydrate (2) were synthesized and structurally characterized. The single-crystal structure was determined by X-ray diffraction. Analysis of the intermolecular interactions occurring in the crystal packing of both compounds, especially those involving the fluorine atoms, was carried out. The formation of crystalline salts or co-crystals from 4-fluorobenzoic acid was also examined.