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Hyperfine Interactions

, Volume 207, Issue 1–3, pp 139–143 | Cite as

Study on the ferromagnetic state in iron mixed-valence complexes, A[FeIIFeIII(dto)3] (A = (n-CnH2n + 1)4N; dto = C2S2O2) by means of Mössbauer spectroscopy

  • Yuki Ono
  • Atsushi Okazawa
  • Masaya Enomoto
  • Norimichi Kojima
Article

Abstract

We have investigated the ferromagnetic states for (n-CnH2n + 1)4N[FeIIFeIII(dto)3] (n = 3–6; dto = C2O2S2) by means of 57Fe Mössbauer spectroscopy. The major component of the spin configuration in the ferromagnetic states for n = 3 and 4 is the low-temperature phase (LTP) with the FeIII (S = 5/2) and FeII (S = 0) states. The high-temperature phase (HTP) of n = 4 remains by more than 20%, which is consistent with two ferromagnetic transitions (TC = 7 & 13 K). Moreover, it was revealed that the Mössbauer spectra in the ferromagnetic states for n = 5 and 6 correspond to the HTP consisting of the FeII (S = 2) and FeIII (S = 1/2) states.

Keywords

Mixed-valence complex Dithiooxalato Ferromagnetism Mössbauer spectroscopy 

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Supplementary material

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Yuki Ono
    • 1
  • Atsushi Okazawa
    • 1
  • Masaya Enomoto
    • 2
  • Norimichi Kojima
    • 1
  1. 1.Graduate School of Arts and SciencesThe University of TokyoTokyoJapan
  2. 2.Department of Chemistry, Faculty of Science Division ITokyo University of ScienceTokyoJapan

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