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In the title compound, [Mn(C 8 H 4 NO 6 ) 2 (C 18 H 11 N 5 ) 2 ], the Mn II  atom is six-coordinated by two  N , N ′-bidentate 6-(pyridin-4-yl)-5 H -cyclo­penta­[ f ][1,10]phenanthroline (pcp) ligands and two carboxyl­ate O atoms from two monodentate 3-carb­oxy-5-nitro­benzoate anions in a distorted  cis -MnO 2 N 4  octa­hedral arrangement. Within the pcp ligands, the dihedral angles between the polycyclic skeletons and pendant pyridine rings are 6.2 (2) and 8.3 (2)°. In the crystal, mol­ecules are linked by O—H⋯N and N—H⋯O hydrogen bonds. Several aromatic π–π stacking inter­actions [shortest centroid–centroid separation = 3.516 (3) Å] are also observed.

Bis(3-carboxy-5-nitrobenzoato)bis[2-(pyridin-4-yl)-1H-imidazo[4,5-f][1,10]phenanthroline]manganese(II)