Hyperfine Interactions

, Volume 217, Issue 1–3, pp 67–72 | Cite as

Spin state tuning in FeII 1D coordination polymers made of 1,2,4-triazol-4-yl-propanoic and butanoic acids

  • Antoine P. Railliet
  • Anil D. Naik
  • Pedro Castanho-Vaz
  • Aurelian Rotaru
  • Marian Grigoras
  • Nicoleta Lupu
  • Jacqueline Marchand-Brynaert
  • Yann Garcia
Article

Abstract

A series of four FeII coordination polymers [Fe(patrz)3]Cl2∙2H2O, [Fe(patrz)3]Cl2, [Fe(batrz)3]Cl2∙2H2O and [Fe(batrz)3]Cl2 was prepared with slight variations in the ligand framework (1,2,4-triazol-4-yl-propanoic acid (patrz) or 1,2,4-triazol-4-yl-butanoic acid (batrz)) and solvation (2H2O or dry). Dramatic influence of chain length and solvent has been evidenced on magnetic properties. Spin crossover properties were carefully studied by temperature dependent SQUID magnetometry and 57Fe Mössbauer spectroscopy. Thermodynamic parameters for [Fe(batrz)3]Cl2∙2H2O were determined by differential scanning calorimetry (DSC) allowing a simulation of the spin crossover behaviour and the quantification of the cooperativity.

Keywords

57Fe Mössbauer spectroscopy Coordination polymers Spin transition 1,2,4-Triazole  Cooperativity Differential scanning calorimetry 

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • Antoine P. Railliet
    • 1
  • Anil D. Naik
    • 1
  • Pedro Castanho-Vaz
    • 1
  • Aurelian Rotaru
    • 2
  • Marian Grigoras
    • 3
  • Nicoleta Lupu
    • 3
  • Jacqueline Marchand-Brynaert
    • 1
  • Yann Garcia
    • 1
  1. 1.Institute of Condensed Matter and NanosciencesUniversité Catholique de LouvainLouvain-la-NeuveBelgium
  2. 2.Faculty of Electrical Engineering and Computer ScienceStefan cel Mare UniversitySuceavaRomania
  3. 3.National Institute of Research and Development for Technical PhysicsIasiRomania

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