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The title complex, [Mn 2 (C 18 H 4 O 10 )(H 2 O) 4 ]  n  , was synthesized from manganese(II) chloride tetra­hydrate and 9,10-dioxo-9,10-dihydro­anthracene-1,4,5,8-tetra­carb­oxy­lic acid (H 4 AQTC) in water. The anthraquinone unit is located about a crystallographic center of inversion. Each asymmetric unit therefore contains one Mn II  atom, two water ligands and one half AQTC 4−  anion. The Mn II  atom is coordinated in a distorted octa­hedral geometry by four O atoms from three AQTC 4−  ligands and two water O atoms. Two of the carboxyl­ate groups coordinate one Mn II  atom in a chelating mode, whereas the others each coordinate two Mn II  atoms. Each AQTC 4−  tetra-anion therefore coordinates six different Mn II  ions and, as a result, a three-dimensional coordination polymer is formed. O—H⋯O hydrogen bonds, some of them bifurcated, between water ligands and neighboring water or anthraquinone ligands are observed in the crystal structure.

Poly[tetraaqua(μ6-9,10-dioxo-9,10-dihydroanthracene-1,4,5,8-tetracarboxylato)dimanganese(II)]

Poly[tetraaqua(μ₆-9,10-dioxo-9,10-dihydroanthracene-1,4,5,8-tetracarboxylato)dimanganese(II)]