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The reaction of dipicolinic acid (2,6-pyridinedicarboxylic acid) with FeCl3 results in the unusual title ion-pair compound, [Fe(C7H3NO4)(H2O)3][Fe(C7H3NO4)2].6H2O. Each Fe atom has an octahedral geometry. The dipicolinate ligands are nearly planar, with the two in the anion being perpendicular to each other and displaying a dihedral angle of 93.74 (6)°. The Fe—O(carboxylate) bond distances are comparable and range from 2.008 (2) to 2.028 (2) Å, while the Fe—N distances are 2.059 (2), 2.054 (2) and 2.054 (2) Å. The Fe—O(water) distances are 1.971 (2), 1.987 (2) and 2.004 (2) Å. The cation, anion and water molecules are involved in an extensive three-dimensional hydrogen-bonding network, with O...O distances ranging from 2.36 (2) to 2.953 (3) Å and angles ranging from 129 to 177°.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks fg1421, global

fcf

Structure factor file (CIF format)
Contains datablock fg1421

CCDC reference: 130380

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