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

José Martínez-Lillo, Miguel Julve, Euan K. Brechin

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)35-39
Number of pages5
JournalPolyhedron
Volume98
Early online date4 Jun 2015
DOIs
Publication statusPublished - 25 Sep 2015

Keywords

  • Diethylacetamide
  • Iron(II) complexes
  • Magnetic properties
  • Rhenium(IV) complexes
  • X-ray diffraction

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