6533b7dcfe1ef96bd1272c47

RESEARCH PRODUCT

Hexakis(diethylacetamide)iron(II) hexahalorhenate(IV) ionic salts: X-ray structures and magnetic properties

José Martínez-lilloEuan K. BrechinMiguel Julve

subject

/dk/atira/pure/subjectarea/asjc/1600/1606/dk/atira/pure/subjectarea/asjc/1600/1604Rhenium(IV) complexes/dk/atira/pure/subjectarea/asjc/2500/2505ChemistryInorganic chemistrySupramolecular chemistryIonic bondingchemistry.chemical_elementDiethylacetamideCrystal structureRheniumIron(II) complexesMagnetic susceptibilityX-ray diffractionInorganic ChemistryCrystallographyOctahedronMagnetic propertiesX-ray crystallographyMaterials ChemistryMoleculePhysical and Theoretical Chemistry

description

Two novel Fe<sup>II</sup>-Re<sup>IV</sup> compounds of general formula [Fe<sup>II</sup>(DEA)<inf>6</inf>][Re<sup>IV</sup>X<inf>6</inf>] where DEA = diethylacetamide and X = Cl (1) and Br (2) have been prepared and magnetostructurally characterised. Complexes 1 and 2 are isomorphic ionic salts that crystallise in the trigonal crystal system with space group R(-3). The rhenium(IV) ion in 1 and 2 is six-coordinate with six chloro (1) or bromo (2) ligands building a regular octahedral chromophore. The Fe<sup>II</sup> ion is also six-coordinate, and bonded to six oxygen atoms from six DEA molecules. [Fe<sup>II</sup>(DEA)<inf>6</inf>]<sup>2+</sup> cations and [Re<sup>IV</sup>X<inf>6</inf>]<sup>2-</sup> anions alternate in the crystal lattice of 1 and 2 generating supramolecular structures whose magnetic properties are dominated by the high anisotropy of the six-coordinate iron(II) and rhenium(IV) ions. Variable-temperature magnetic susceptibility data of 1 and 2 are well reproduced by a model of isolated S = 2 (Fe<sup>II</sup>) and S = 3/2 (Re<sup>IV</sup>) centres with high values of the local zero-field splitting. 1 and 2 are the first examples of hexahalorhenate(IV) salts incorporating Fe<sup>II</sup> complex cations to have been magnetostructurally investigated.

https://doi.org/10.1016/j.poly.2015.05.036