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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Corresponding author. E-mail: paulsen@physik.uni-luebeck.de
Received June 26, 2002; accepted July 22, 2002
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Paulsen, H., Duelund, L., Zimmermann, A. et al. Substituent Effects on the Spin-Transition Temperature in Complexes with Tris(pyrazolyl) Ligands. Monatshefte für Chemie 134, 295–306 (2003). https://doi.org/10.1007/s00706-002-0522-7
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DOI: https://doi.org/10.1007/s00706-002-0522-7