Acta Cryst. (2008). E64, m1300-m1301  [ doi:10.1107/S1600536808029280 ]

2,6-Diaminopyridinium bis(4-hydroxypyridine-2,6-dicarboxylato-³O²,N,O⁶)ferrate(III) dihydrate

M. Rafizadeh, Z. Derikvand and A. Nemati

Abstract: The reaction of iron(II) sulfate heptahydrate with the proton-transfer compound (pydaH)(hypydcH) (pyda = pyridine-2,6-diamine; hypydcH₂ = 4-hydroxypyridine-2,6-dicarboxylic acid) in an aqueous solution led to the formation of the title compound, (C₅H₈N₃)[Fe(C₇H₃NO₅)₂]·2H₂O. The anion is a six-coordinated complex with a distorted octahedral geometry around the Fe^III atom. Extensive intermolecular O-HO, N-HO and C-HO hydrogen bonds, involving the complex anion, (pydaH)⁺ counter-ion and two uncoordinated water molecules, and - [centroid-to-centroid distance 3.323 (11) Å] and C-O [O-centroid distance 3.150 (15) Å] interactions connect the various components into a supramolecular structure.

Online 20 September 2008

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