A new pathway of preparation and refined structure of (NH4)2[FeCl5(H2O)]
Institute of Inorganic Chemistry, Technology and Materials, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia
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Abstract: The title compound, (NH4)2[FeCl5H2O] has been prepared by reaction between iron(III) chloride and ammonium chloride which was formed by hydrolysis of isonicotinamide or thionicotinamide in ethanol. The characterization was based on elemental analysis and infrared spectra. The crystal structure of the title compound has been refined by single crystal X-ray diffraction method at 293 K. Crystals are orthorhombic, Pnma, with unit cell parameters: a = 13.760(1) Å, b = 9.960(1) Å, c = 7.060(1) Å, Z = 4 and R = 3.5 %. The iron(III) atom in [FeCl5(H2O)]2– ion is approximately octahedrally coordinated by five Cl atoms and one O atom of H2O molecule. This distortion is caused by the extensively hydrogen-bonded lattice. Structural parameters and IR spectra of similar compounds are compared and discussed.
Keywords: ammonium salt, aqua-pentachloroferrate(III), crystal structure, iron, IR-spectrum
Full paper in Portable Document Format: acs_0155.pdf
Acta Chimica Slovaca, Vol. 6, No. 1, 2013, pp. 129—132, DOI: 10.2478/acs-2013-0020