Short hydrogen bonds in a new salt of pyromellitic acid: An experimental charge density investigation

An analysis of intra- and intermolecular short hydrogen bonds in a new salt of nicotinic acid (3-pyridinecarboxylic acid), Nic, and pyromellitic acid (1,2,4,5-benzenetetracarboxylic acid), H4Pm, with formula (HNic)2(H2Pm), 1, has been carried out by single-crystal X-ray diffraction method at 120 K. The experimental charge density has been performed using multipolar functions and analyzed by Quantum Theory of Atoms in Molecules, which gave evidence for the partly covalent character of those interactions.

► Intra- and intermolecular short hydrogen bonds in a new pyromellitic acid derived salt. ► Experimental charge-density investigation of hydrogen bonds using Quantum Theory of Atoms in Molecules. ► Topological parameters indicated partly covalent character of short hydrogen bonds.