4,4′-Bipyridine–3-nitrobenzoic acid (1/2)

Abstract

The title compound, C10H8N2·2C7H5NO4,was obtained unintentionally as the harvested product of the hydrothermal reaction between Co(OAc)2·4H2O and 4,4′-bipyridine in the presence of 3-nitrophthalic acid. In the reaction, 3-nitrophthalic acid is transformed into 3-nitrobenzoic acid by an in situ decarboxylation reaction, in which the carboxylate group is not deprotonated and is uncoordinated. In the crystal, the uncoordinated 3-nitrobenzoic acid and free 4,4′-bipyridine molecules are linked alternately by O—H...N hydrogen bonds into chains, which are assembled by C—H...O hydrogen bonds into a three-dimensional supramolecular network.