catena-Poly[[[diaquairon(II)]-μ-pyridine-2,5-dicarboxylato-[tetraaquairon(II)]-μ-pyridine-2,5-dicarboxylato] tetrahydrate]

Abstract

In the crystal structure of the title compound, {[Fe2(C7H3NO4)2(H2O)6]·4H2O}n, there are two types of coordination for the FeII atoms. One FeII atom is in a distorted octahedral N2O4 environment, with two chelating rings from the pyridinedicarboxylate ligands and two O atoms from the water molecules, while the other is in a distorted octahedral O6 environment with two O atoms from the pyridinedicarboxylate ligands and four O atoms from the water molecules. Both FeII atoms lie on crystallographic centers of symmetry. The complex possesses an infinite chain structure running along the [101] direction. These chains are interconnected by the uncoordinated water molecules through O—H...O hydrogen bonds.