The compound 4-hydrazinobenzoic acid hydrochloride (4-HBA), C7H9O2ampersand-flag-changemiddot;Cl, has been synthesized and characterized by FT-IR spectroscopy and X-ray diffraction. The compound crystallizes as colourless needles in a triclinic system, space group Pˉ1 (Z = 2), and cell parameters a = 3.7176 (4) ampersand-flag-changeAring;, b = 5.9133 (4) ampersand-flag-changeAring;, c = 19.3631 (13) ampersand-flag-changeAring;, Α = 87.841 (6), B = 88.924 (6), ampersand-flag-changegamma; = 80.203 (6), V = 419.13 (6) ampersand-flag-changeAring;3. The component ions are linked by a combination of O-H⋯O, N-H⋯N and N-H⋯Cl hydrogen bonds to form a complex three-dimensional framework structure in which each cation is linked to two other cations, by O-H⋯O and N-H⋯N hydrogen bonds, and to five different anions, while each anion accepts hydrogen bonds from five different cations. Calculations on the Non-Covalent Interactions (NCI) amplify the crystallographic conclusions concerning the interionic hydrogen bonds.
