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In the title coupound, [Mn(C9H6O4)(C12H8N2)]n, the MnII ion is coordinated by two N atoms [Mn—N = 2.273 (3) and 2.305 (2) Å] from a 1,10-phenanthroline ligand and four O atoms [Mn—O = 2.112 (2)–2.343 (3) Å] from three 5-methylisophthalate (mip) ligands in a distorted octahedral geometry. Each mip dianion acts as a tetradentate ligand connecting three Mn ions. The crystal packing exhibits π–π interactions [3.599 (2)–3.755 (2) Å] between the centroids of the six-membered rings of neighbouring 1,10-phenanthroline ligands.