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Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand

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Abstract

The spin-crossover behaviors of mixed-valence iron compounds [FeIIH3L][FeIIIL](NO3)2 (1) and [FeIIH3LMe][FeIIILMe](NO3)2 (2) have been investigated by 57Fe Mössbauer spectroscopy, where H3L is a hexadentate N6 tripod ligand containing three imidazole groups and H3LMe is its 2-methylimidazole derivative. Deconvolution analyses of the Mössbauer spectra revealed that a two-step SCO (LS FeII–LS FeIII→HS FeII–LS FeIII→HS FeII–HS FeIII) proceeds in each compound on elevating the temperature. Compound 2 exhibited lower spin-transition temperatures than 1. “Frozen-in effect” was observed below 120 and 50 K for 1 and 2, respectively.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki, 305-8566, Japan

    S. Iijima, F. Mizutani & O. Niwa

  2. Department of Chemistry, Faculty of Science, Kumamoto University, Kurokami 2-39-1, Kumamoto, 860-8555, Japan

    N. Matsumoto

  3. Department of Chemistry, Faculty of Science, Okayama University, Tsushima-naka 3-1-1, Okayama, 700-8555, Japan

    Y. Sunatsuki & M. Kojima

Authors
  1. S. Iijima
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  2. F. Mizutani
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  3. O. Niwa
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  4. N. Matsumoto
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  5. Y. Sunatsuki
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  6. M. Kojima
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Correspondence to S. Iijima.

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Iijima, S., Mizutani, F., Niwa, O. et al. Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand. Hyperfine Interact 166, 397–402 (2005). https://doi.org/10.1007/s10751-006-9299-0

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  • DOI: https://doi.org/10.1007/s10751-006-9299-0

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