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In the title complex, {[CaZn(C 10 H 2 O 8 )(H 2 O) 2 ]·H 2 O}  n  , the Zn II  ion is coordinated by four O atoms from four benzene-1,2,4,5-tetra­carboxyl­ate anions in a distorted tetra­hedral geometry. The Ca II  ion is eight-coordinated by six O atoms from four benzene-1,2,4,5-tetra­carboxyl­ate anions and by two water mol­ecules in a distorted square-anti­prismatic geometry. The Ca II  and Zn II  ions and the lattice water mol­ecule are located on twofold rotation axes; the centroid of the benzene-1,2,4,5-tetra­carboxyl­ate anion is located on a centre of inversion. The μ 8 -bridging mode of the anion results in the formation of a three-dimensional structure with channels extending along [100] in which lattice water mol­ecules are situated. Inter­molecular O—H⋯O hydrogen bonds involving the coordinating and lattice water mol­ecules as donors and the carboxyl­ate O atoms and lattice water mol­ecules as acceptors are present in the structure.

Poly[[diaqua(μ8-benzene-1,2,4,5-tetracarboxylato)calciumzinc] monohydrate]

Poly[[diaqua(μ₈-benzene-1,2,4,5-tetracarboxylato)calciumzinc] monohydrate]