Triaqua-1κ3O-μ-cyanido-1:2κ2N:C-pentacyanido-2κ5C-tetrakis(dimethylformamide-1κO)-1-holmium(III)-2-iron(III) monohydrate

Abstract

In the bimetallic cyanide-bridged title complex, [Fe0.98HoRu0.02(CN)6(C3H7NO)4(H2O)3]·H2O, the HoIII ion is in a slightly distorted square-antiprismatic arrangement formed by seven O atoms from four dimethylformamide (DMF) molecules and three water molecules, and one N atom from a bridging cyanide group connected with the FeIII atom which is octahedrally coordinated by six cyanide groups. In the crystal, molecules are held together through O—H...N and O—H...O hydrogen-bonding interactions to form a three-dimensional framework. Elemental analysis of one of the precursors and the crystal shows that there is a slight contamination of Fe by Ru. The Fe site displays, therefore, small substitutional disorder with site-occupancy factors Fe/Ru = 0.98:0.02. The two methyl groups of two dimethylformamide ligands are positionally disordered with site-occupancy factors of 0.44 (3):0.56 (3) and 0.44 (3):0.56 (3).