Potassium Aqua(3,4-toluenediamine-N,N,N',N'-tetraacetato)ferrate(III)-Water (1/1.5)

The ligand (3,4-toluenediamine-N,N,N',N'-tetraacetic acid in the title compound, K[Fe(C₁₅H₁₄N₂O₈)H₂O].1.5H₂O is hexadentate, but the central iron(III) ion is seven-coordinate, with one coordinated water molecule. The complex has a roughly pentagonal bipyramidal geometry. The Fe-N bond lengths are 2.304 (3) Å in the para position and 2.349 (3) Å in the meta position with respect to the methyl group. The presence of the CH₃ group increases the basicity of the N atom in the para position, shortening the length of the Fe-N bond.

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