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The Hexakis(thiocyanato)ferrate(III) Ion: a Coordination Chemistry Classic Reveals an Interesting Geometry Pattern for the Thiocyanate Ligands

  1. Anthony W. Addison1,
  2. Raymond J. Butcher2,
  3. Zoltán Homonnay3,
  4. Vitaly V. Pavlishchuk4,
  5. Michael J. Prushan5,
  6. Laurence K. Thompson6

Article first published online: 15 JUN 2005

DOI: 10.1002/ejic.200400867

Issue

European Journal of Inorganic Chemistry

European Journal of Inorganic Chemistry

Volume 2005, Issue 12, pages 2404–2408, June 2005

Additional Information

How to Cite

Addison, A. W., Butcher, R. J., Homonnay, Z., Pavlishchuk, V. V., Prushan, M. J. and Thompson, L. K. (2005), The Hexakis(thiocyanato)ferrate(III) Ion: a Coordination Chemistry Classic Reveals an Interesting Geometry Pattern for the Thiocyanate Ligands. Eur. J. Inorg. Chem., 2005: 2404–2408. doi: 10.1002/ejic.200400867

Author Information

  1. 1

    Chemistry Department, Drexel University, Philadelphia, PA 19104-2875, USA

  2. 2

    Chemistry Department, Howard University, Washington, DC 20059, USA

  3. 3

    Department of Nuclear Chemistry, Eötvös Loránd University, Pázmány P. s 1/A, 1117 Budapest, Hungary

  4. 4

    L.V. Pisarzhevskii Institute of Physical Chemistry, Ukrainian Academy of Sciences, Prospekt Nauki 31, Kiev, 03028 Ukraine

  5. 5

    Department of Chemistry & Biochemistry, LaSalle University, Philadelphia, PA 19141, USA

  6. 6

    Chemistry Department, Memorial University, St. John’s NFD, A1B 3X7 Canada

Publication History

  1. Issue published online: 15 JUN 2005
  2. Article first published online: 15 JUN 2005
  3. Manuscript Received: 14 OCT 2004

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Keywords:

  • Iron;
  • Thiocyanate;
  • X-ray diffraction;
  • Magnetic properties;
  • IR spectroscopy;
  • Moessbauer spectroscopy;
  • Coordination modes;
  • Isomers

Abstract

(NMe4)3[Fe(NCS)6] crystallizes from ethanol in the monoclinic space group C2/c. Two different types of complex ions are contained in the unit cell, though both possess exclusively N-coordination of the thiocyanate ligands. In one ion, the thiocyanate ligands are all essentially linearly bound, with an Fe–N–C angle of 174 ± 4°, while in the other, there are two cis-thiocyanate ligands with a notably small Fe–N–C angle of 146.5°. The EPR and Mössbauer results show that all the iron(III) centers maintain the high-spin state down to 80 K, while the magnetic susceptibility confirms this to 2 K. Infrared and Mössbauer spectra provide evidence for an unusually “soft” lattice. Traditional criteria for interpretation of the infrared frequencies are not strictly applicable for this compound. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)

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