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Stepwise magnetic behavior of the liquid crystal iron(III) complex

  • Current NMR and EPR Spectroscopy Methods in Structural Chemistry of Complex Crystals, Glasses, Composites, and Biological Membranes
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Abstract

EPR and Mössbauer spectroscopy is used to study a new liquid crystal complex of iron(III) with a Schiff base: 4,4′-dodecyloxybenzoyloxybenzoyl-4-oxysalicylidene-2-aminopyridine with a PF −6 counterion. It is shown that Fe(III) ions exist only in the high-spin (HS, S = 5/2) state. It is found that under the influence of temperature the system demonstrates the stepwise behavior of the product of the integrated intensity of EPR lines (I) and temperature (proportional to χ T, where χ is the magnetic susceptibility) with an inflection point at ∼80 K. Above 80 K a new EPR spectrum is detected due to the excited S = 2 state and the formation of dimeric molecules (through oxygen bridges) with a strong intramolecular antiferromagnetic exchange interaction J 1 = 162.1 cm−1. Below 80 K iron(III) complexes are organized in 1D chains where the exchange value J 2 = 2.1 cm−1. At 80 K there is a structural phase transition in the system: the transition from a 1D chain organization of HS Fe(III) centers to dimeric molecules. Based on quantum chemical calculations a model of the binuclear iron(III) complex is proposed.

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Authors and Affiliations

  1. Kazan Physical-Technical Institute, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russia

    N. E. Domracheva & V. E. Vorob’eva

  2. Kazan (Volga region) Federal University, Kazan, Russia

    A. V. Pyataev & R. A. Manapov

  3. Kazan National Research Technological University, Kazan, Russia

    E. M. Zueva

  4. G. A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia

    M. S. Gruzdev & U. V. Chervonova

Authors
  1. N. E. Domracheva
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  2. V. E. Vorob’eva
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  3. A. V. Pyataev
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  4. R. A. Manapov
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  5. E. M. Zueva
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  6. M. S. Gruzdev
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  7. U. V. Chervonova
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Correspondence to N. E. Domracheva.

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Original Russian Text Copyright © 2013 by N. E. Domracheva, V. E. Vorob’eva, A. V. Pyataev, R. A. Manapov, E. M. Zueva, M. S. Gruzdev, U. V. Chervonova

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Translated from Zhurnal Strukturnoi Khimii, Vol. 54, Supplement 1, pp. S20–S31, 2013.

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Domracheva, N.E., Vorob’eva, V.E., Pyataev, A.V. et al. Stepwise magnetic behavior of the liquid crystal iron(III) complex. J Struct Chem 54 (Suppl 1), 16–27 (2013). https://doi.org/10.1134/S0022476613070020

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  • DOI: https://doi.org/10.1134/S0022476613070020

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