2,9-Dimethyl-1,10-phenanthrolin-1-ium 2,4,5-tricarboxybenzoate monohydrate

Abstract

In the preparation of the title hydrated salt, C14H13N2+·C10H5O8−·H2O, a proton has been transfered to the 2,9-dimethyl-1,10-phenanthrolinium cation, forming a 2,4,5-tricarboxybenzoate anion. In the anion, the mean planes of the protonated carboxylate groups form dihedral angles of 11.0 (5), 4.4 (5) and 80.3 (4)° with the benzene ring to which they are attached. The mean plane of the deprotonated carboxylate group forms a dihedral angle of 10.6 (5)° with the benzene ring. In the crystal, the anions are involved in carboxylic acid O—H...Ocarboxylhydrogen bonds, generating a two-dimensional network parallel to (001) containingR44(28) andR44(32) motifs. The 2,9-dimethyl-1,10-phenanthrolinium cations and water molecules reside between the anion layers and are connected to the anionsviaN—H...Owaterand Owater—H...Ocarboxylhydrogen bonds. An intramolecular O—H...O hydrogen bond is also observed in the anion.