Abstract
The title compound, [Zn3(C6H5O7)2(H2O)2]n, is a polymer in which the repeating unit contains three zinc atoms, two hepta-dentate Hcit ligands (Hcit = citric acid trianion) and two coordinated water molecules, only half of which are independent due to one of the metal atoms lying on a centre of symmetry. The two independent cations both exhibit an octahedral geometry, but the way in which they are coordinate are different; while the Zn atom in a general position is bound to three Hcit ligands and one water molecule, the one at the centre of symmetry is coordinated by six O atoms from two symmetry-related Hcit ligands through the (protonated) hydroxyl and carboxylate groups. The three carboxylate groups coordinate to the Zn centres in three different ways, viz. chelating, bridging and a mixture of both, in an unusual coordination mode for citrate. The result is a two-dimensional structure parallel to (010), built up by a square-grid motif. Intermolecular O—H⋯O hydrogen bonds are present in the crystal structure
Highlights
The title compound, [Zn3(C6H5O7)2(H2O)2]n, is a polymer in which the repeating unit contains three zinc atoms, two heptadentate Hcit ligands (Hcit = citric acid trianion) and two coordinated water molecules, only half of which are independent due to one of the metal atoms lying on a centre of symmetry
The two independent cations both exhibit an octahedral geometry, but the way in which they are coordinate are different; while the Zn atom in a general position is bound to three Hcit ligands and one water molecule, the one at the centre of symmetry is coordinated by six O atoms from two symmetry-related Hcit ligands through the hydroxyl and carboxylate groups
The three carboxylate groups coordinate to the Zn centres in three different ways, viz. chelating, bridging and a mixture of both, in an unusual coordination mode for citrate
Summary
The title compound, [Zn3(C6H5O7)2(H2O)2]n, is a polymer in which the repeating unit contains three zinc atoms, two heptadentate Hcit ligands (Hcit = citric acid trianion) and two coordinated water molecules, only half of which are independent due to one of the metal atoms lying on a centre of symmetry. The two independent cations both exhibit an octahedral geometry, but the way in which they are coordinate are different; while the Zn atom in a general position is bound to three Hcit ligands and one water molecule, the one at the centre of symmetry is coordinated by six O atoms from two symmetry-related Hcit ligands through the (protonated) hydroxyl and carboxylate groups. The three carboxylate groups coordinate to the Zn centres in three different ways, viz. Intermolecular O—HÁ Á ÁO hydrogen bonds are present in the crystal structure
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