Hyperfine Interactions

, Volume 205, Issue 1–3, pp 51–55 | Cite as

1D iron(II) spin crossover complexes with 1,2,4-triazol-4-yl-propanoic acid

  • Antoine P. Railliet
  • Anil D. Naik
  • Aurelian Rotaru
  • Jacqueline Marchand-Brynaert
  • Yann Garcia


A series of 1D coordination polymers [Fe(patrz)3]X2·solv, (patrz = 1,2,4-triazol-4-yl-propanoic acid; X = BF\(_{4}^{-}\), ClO\(_{4}^{-}\), Cl − , NO\(_{3}^{-}\) and solv = MeOH or H2O) were precipitated from methanol. Their spin crossover properties were studied by temperature dependent SQUID magnetometry and 57Fe Mössbauer spectroscopy, both for solvated and desolvated complexes. Compounds show gradual incomplete spin crossover with distinct thermochromism, in particular [Fe(patrz)3](BF4)2·MeOH, for which only 27% of FeII ions are switched to the low-spin state at 77 K, as determined by a detailed 57Fe Mössbauer study. Other prominent features of this work are the interesting self assembly of 1D chain with exclusively triazole coordination from patrz ligand despite its ditopic nature and a hysteretic room temperature spin crossover in [Fe(patrz)3]Cl2.


57Fe Mössbauer spectroscopy Coordination polymers Spin-transition 1,2,4-Triazole 


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Antoine P. Railliet
    • 1
  • Anil D. Naik
    • 1
  • Aurelian Rotaru
    • 2
  • Jacqueline Marchand-Brynaert
    • 1
  • Yann Garcia
    • 1
  1. 1.Institute of Condensed Matter and NanosciencesUniversité Catholique de LouvainLouvain-la-NeuveBelgium
  2. 2.Department of Electrical Engineering and Computer Science“Stefan cel Mare” UniversitySuceavaRomania

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