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Substituent Effects on the Spin-Transition Temperature in Complexes with Tris(pyrazolyl) Ligands

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Molecular Magnets Recent Highlights

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Summary

Iron (II) complexes with substituted tris(pyrazolyl) ligands, which exhibit a thermally driven transition from a low-spin state at low temperatures to a high-spin state at elevated temperatures, have been studied by Mössbauer spectroscopy and magnetic susceptibility measurements. From the observed spectra the molar high-spin fraction and the transition temperature have been extracted. All substituents, except for bromine, lead to a decrease of the transition temperature. Density functional calculations have been carried out to compare the experimentally observed shifts of the transition temperature with those derived from theory.

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Authors and Affiliations

  1. Institut für Physik, Universität zu Lübeck, D-23538, Lübeck, Germany

    Hauke Paulsen, Frédéric Averseng, Michael Gerdan, Heiner Winkler & Alfred X. Trautwein

  2. MEMPHYS — Center for Biomembrane Physics, Department of Chemistry, University of Southern Denmark, DK-5230, Odense, Denmark

    Lars Duelund

  3. Department of Chemistry, University of Southern Denmark, 5230, Odense, Denmark

    Axel Zimmermann & Hans Toftlund

Authors
  1. Hauke Paulsen
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  2. Lars Duelund
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  3. Axel Zimmermann
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  4. Frédéric Averseng
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  5. Michael Gerdan
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  6. Heiner Winkler
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  7. Hans Toftlund
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  8. Alfred X. Trautwein
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Editors and Affiliations

  1. Institute of Applied Synthetic Chemistry, Vienna University of Technology, Vienna, Austria

    Wolfgang Linert

  2. “Chimie Inorganique et Matériaux Moléculaires” Laboratory, Pierre et Marie Curie University, Paris, France

    Michel Verdaguer (Chairman of the “Molecular Magnets” Programme of the European Science Foundation) (Chairman of the “Molecular Magnets” Programme of the European Science Foundation)

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© 2003 Springer-Verlag Wien

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Paulsen, H. et al. (2003). Substituent Effects on the Spin-Transition Temperature in Complexes with Tris(pyrazolyl) Ligands. In: Linert, W., Verdaguer, M. (eds) Molecular Magnets Recent Highlights. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6018-3_13

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  • DOI: https://doi.org/10.1007/978-3-7091-6018-3_13

  • Publisher Name: Springer, Vienna

  • Print ISBN: 978-3-7091-7300-8

  • Online ISBN: 978-3-7091-6018-3

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