A proton-transfer compound: 1,10-phenanthrolinium–2,4,5-tricarboxybenzoate–2,5-dicarboxybenzene-1,4-dicarboxylate (4/2/1)

Abstract

The title compound, 4C12H9N2+·2C10H5O8−·C10H4O82−, contains singly and doubly deprotonated tetracarboxylic acids and the protonated form of 1,10-phenanthroline; the dianion is centrosymmetric. The crystal structure is stabilized by strong inter­molecular O—H⋯O and N—H⋯N hydrogen bonds, linking the ions to form a three-dimensional network.