Abstract

The title compound, [Fe2(C3H2O4)2(C4H4N2)(H2O)2]n, prepared by hydro­thermal synthesis, is isostructural with its CoII, NiII, ZnII and CdII analogues. The FeII atoms are linked via coordinated malonates into two-dimensional sheets containing cavities. The sheets are connected by bridging pyrazine ligands which lie on centres of inversion. The coordination geometry around FeII is a tetra­gonally elongated octa­hedron, in which pyrazine N and aqua O atoms occupy the axial positions. The coordinated water mol­ecules form O—H⋯O hydrogen bonds to the malonate ligands.

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