Crystal structure and spin crossover studies on bis(2,6-bis(benzimidazol-2-yl)pyridine) iron(II) perchlorate

Research output: Contribution to journal › Article › Research › peer review

Authors

  • Roman Boča
  • Peter Baran
  • L'ubor Dlháň
  • Hartmut Fuess
  • Wolfgang Haase
  • Franz Renz
  • Wolfgang Linert
  • Ingrid Svoboda
  • Rüdiger Werner

Research Organisations

External Research Organisations

  • Slovak University of Technology in Bratislava
  • Technische Universität Darmstadt
  • TU Wien (TUW)
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Details

Original languageEnglish
Pages (from-to)129-136
Number of pages8
JournalInorganica chimica acta
Volume260
Issue number2
Publication statusPublished - 30 Jul 1997

Abstract

The structure of the [Fe(bzimpy)2] (ClO4)2 · xH2O system (x=0.25) was determined by single crystal X-ray structure analysis. The Fe(II) ion is hexacoordinated by six donor nitrogen atoms. The magnetic properties of the complex were investigated by powder magnetic susceptibility measurements and ESR. The freshly prepared sample does not show any traces of iron(III) impurities but these are formed as a function of time. After 1 year the sample contains 8.2% iron(III) as shown by UV spectroscopy and indicated by geff=4.3 and 2.0 in its ESR spectrum. This explains the recorded x versus T behaviour at low temperature: with increasing temperature the x value decreases according to the Curie-Weiss law for a S=5/2 system having an effective g=4.3. Above 220 K a continuous increase in the x value is observed and a spin crossover applies. The spin transition is not complete at room temperature. A pronounced hysteresis is observed upon heating/cooling the sample between 220 and 414 K on the basis of magnetic data and infrared spectra.

Keywords

    Crystal structures, Hysteresis, Iron(ii) complexes, Magnetism, Spin crossover

ASJC Scopus subject areas

Cite this

Crystal structure and spin crossover studies on bis(2,6-bis(benzimidazol-2-yl)pyridine) iron(II) perchlorate. / Boča, Roman; Baran, Peter; Dlháň, L'ubor et al.
In: Inorganica chimica acta, Vol. 260, No. 2, 30.07.1997, p. 129-136.

Research output: Contribution to journal › Article › Research › peer review

Boča, R, Baran, P, Dlháň, L, Fuess, H, Haase, W, Renz, F, Linert, W, Svoboda, I & Werner, R 1997, 'Crystal structure and spin crossover studies on bis(2,6-bis(benzimidazol-2-yl)pyridine) iron(II) perchlorate', Inorganica chimica acta, vol. 260, no. 2, pp. 129-136. https://doi.org/10.1016/S0020-1693(96)05550-8
Boča, R., Baran, P., Dlháň, L., Fuess, H., Haase, W., Renz, F., Linert, W., Svoboda, I., & Werner, R. (1997). Crystal structure and spin crossover studies on bis(2,6-bis(benzimidazol-2-yl)pyridine) iron(II) perchlorate. Inorganica chimica acta, 260(2), 129-136. https://doi.org/10.1016/S0020-1693(96)05550-8
Boča R, Baran P, Dlháň L, Fuess H, Haase W, Renz F et al. Crystal structure and spin crossover studies on bis(2,6-bis(benzimidazol-2-yl)pyridine) iron(II) perchlorate. Inorganica chimica acta. 1997 Jul 30;260(2):129-136. doi: 10.1016/S0020-1693(96)05550-8
Boča, Roman ; Baran, Peter ; Dlháň, L'ubor et al. / Crystal structure and spin crossover studies on bis(2,6-bis(benzimidazol-2-yl)pyridine) iron(II) perchlorate. In: Inorganica chimica acta. 1997 ; Vol. 260, No. 2. pp. 129-136.
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AU - Boča, Roman

AU - Baran, Peter

AU - Dlháň, L'ubor

AU - Fuess, Hartmut

AU - Haase, Wolfgang

AU - Renz, Franz

AU - Linert, Wolfgang

AU - Svoboda, Ingrid

AU - Werner, Rüdiger

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N2 - The structure of the [Fe(bzimpy)2] (ClO4)2 · xH2O system (x=0.25) was determined by single crystal X-ray structure analysis. The Fe(II) ion is hexacoordinated by six donor nitrogen atoms. The magnetic properties of the complex were investigated by powder magnetic susceptibility measurements and ESR. The freshly prepared sample does not show any traces of iron(III) impurities but these are formed as a function of time. After 1 year the sample contains 8.2% iron(III) as shown by UV spectroscopy and indicated by geff=4.3 and 2.0 in its ESR spectrum. This explains the recorded x versus T behaviour at low temperature: with increasing temperature the x value decreases according to the Curie-Weiss law for a S=5/2 system having an effective g=4.3. Above 220 K a continuous increase in the x value is observed and a spin crossover applies. The spin transition is not complete at room temperature. A pronounced hysteresis is observed upon heating/cooling the sample between 220 and 414 K on the basis of magnetic data and infrared spectra.

AB - The structure of the [Fe(bzimpy)2] (ClO4)2 · xH2O system (x=0.25) was determined by single crystal X-ray structure analysis. The Fe(II) ion is hexacoordinated by six donor nitrogen atoms. The magnetic properties of the complex were investigated by powder magnetic susceptibility measurements and ESR. The freshly prepared sample does not show any traces of iron(III) impurities but these are formed as a function of time. After 1 year the sample contains 8.2% iron(III) as shown by UV spectroscopy and indicated by geff=4.3 and 2.0 in its ESR spectrum. This explains the recorded x versus T behaviour at low temperature: with increasing temperature the x value decreases according to the Curie-Weiss law for a S=5/2 system having an effective g=4.3. Above 220 K a continuous increase in the x value is observed and a spin crossover applies. The spin transition is not complete at room temperature. A pronounced hysteresis is observed upon heating/cooling the sample between 220 and 414 K on the basis of magnetic data and infrared spectra.

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