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

Two novel FeII–ReIV compounds of general formula [FeII(DEA)6][ReIVX6] 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 FeII ion is also six-coordinate, and bonded to six oxygen atoms from six DEA molecules. [FeII(DEA)6]2+ cations and [ReIVX6]2− 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 (FeII) and S = 3/2 (ReIV) centres with high values of the local zero-field splitting. 1 and 2 are the first examples of hexahalorhenate(IV) salts incorporating FeII complex cations to have been magnetostructurally investigated.

Two novel hexahalorhenate(IV) salts with FeII cations have been prepared and magnetostructurally studied. These compounds are the first examples of hexahalorhenate(IV) salts incorporating FeII complex cations.Figure optionsDownload as PowerPoint slide