Structural and physico-chemical characteristics of tetraethylammonium tetrachloridoferrate(III)

• DOI: 10.1007/s11224-009-9537-6
• Publication Date: 2009-11-11T11:21:21Z
• Authors: Z. Warnke; E. Styczeń; D. Wyrzykowski; A. Sikorski; J. Kłak; J. Mroziński
• Keywords: Tetraethylammonium

The crystal structure of tetraethylammonium tetrachloridoferrate(III) was determined. The crystals are hexagonal, space group P63 mc, a = 8.198(1) A, b = 8.198(1) A, c = 13.183(3) A, V = 767.3(2) A3, Z = 2. The asymmetric unit of [(C2H5)4N][FeCl4] consists of half each of a tetraethylammonium cation and a tetrachloridoferrate(III) anion. Tetrachloridoferrate(III) ion adopts almost ideal tetrahedral geometry. Structural characterization of the compound is supplemented by the results of its magnetic susceptibility measurements and electron paramagnetic resonance (EPR) spectra. Magnetic measurements of a powdered [(C2H5)4N][FeCl4] sample gave a negative Weiss constant of −1.57, which suggests antiferromagnetic coupling. The susceptibility curve of [(C2H5)4N][FeCl4] against temperature exhibits a maximum, indicating the presence of antiferromagnetic ordering with a Neel temperature of approximately 2.9 K.