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The asymmetric unit of the title complex, [Tb2(C7H5O2)6(C12H8N2)2]·2C7H6O2, consists of one-half of the complex mol­ecule, which lies on a crystallographic inversion centre, and one benzoic acid solvent mol­ecule. The two TbIII ions are linked by four bridging benzoate ions, with a Tb...Tb distance of 3.9280 (6) Å. Additionally, each TbIII ion is coordinated by one phenanthroline heterocycle and a bidentate benzoate ion. The irregular nine-coordinated geometry of the TbIII ion is composed of seven O and two N atoms. The mol­ecular structure is stabilized by intra­molecular C—H...O hydrogen bonds. In the crystal structure, mol­ecules are linked into chains along the a axis by inter­molecular C—H...O hydrogen bonds. The crystal structure is further stabilized by inter­molecular C—H...O and C—H...π inter­actions. Weak π–π inter­actions are also observed [centroid–centroid distances = 3.6275 (14)–3.6604 (14) Å].
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