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In the title compound, [Mn(C12H8N2)2(H2O)2]SO4·6H2O, the complex cations assemble into positively charged sheets parallel to (010) via intermolecular π–π stacking interactions with a mean interplanar distance of 3.410 (6) along [100] and 3.465 (5) Å along [001]. The sulfate anions and uncoordinated water molecules are interconnected between these layers by hydrogen bonds, forming negatively charged layers which are linked to the positive layers through O—H...O hydrogen bonds, forming a three-dimensional architecture. Both the positive and negative sheets are stacked along [010] in an ...ABAB... sequence, the A layers being shifted by 1/2a along [100] with respect to the B layers. One of the uncoordinated water molecules is equally disordered over two positions.