| Summary: | The title compound, [Eu2(C7H5O2)6(C15H11N3)2(H2O)2]·2C7H6O2, is a co-crystalline compound containing a dinuclear EuIII coordination complex with inversion symmetry co-crystallized with benzoic acid in a 1:2 ratio. The Eu3+ ions within the dimer are nine-coordinate, containing one tridentate terpyridine, one water, and four benzoate ions, two of which bridge the Eu3+ ions. Of the four benzoate ligands coordinating to each Eu3+ position, three distinct coordination modes [monodentate, bidentate–chelating, and bidentate–bridging (twice)] are observed. Within the crystal, there are two additional uncoordinating benzoic acid molecules per dinuclear complex. Within the dimer, the water bound to each Eu3+ ion participates in intramolecular hydrogen bonding with a coordinating benzoate. Additionally, the carboxylic acid group on the benzoic acid participates in intermolecular hydrogen bonding with a benzoate ligand bound to the dimer complex.
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