Temperature and pressure effects on the spin state of ferric ions in the [Fe(sal2-trien)][Ni(dmit)2] spin crossover complex

Petra Á Szilágyi, Stéphane Dorbes, Gábor Molnár, José Antonio Real, Zoltán Homonnay, Christophe Faulmann, Azzedine Bousseksou

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Thermal and pressure effects have been investigated on the [Fe(sal 2-trien)][Ni(dmit)2] spin crossover complex by means of Mössbauer spectroscopic, calorimetric. X-ray diffraction and magnetic susceptibility measurements. The complex displays a complete thermal spin transition between the S = 5/2 and S = 1/2 spin states of FeIII near 245 K with a hysteresis loop of ca. 30 K. This transition is characterised by a change of the enthalpy, ΔHL = 7 kj/mol, entropy, ΔHL = 29J/Kmol, and the unit cell volume, ΔHL = 15.4Å3, Under hydrostatic pressures up to 5.7kbar the thermal transition shifts to higher temperatures by ca. 16K/kbar. Interestingly, at a low applied pressure of 500bar the hysteresis loop becomes wider (ca. 61 K) and the transition is blocked at ∼50% upon cooling, indicating a possible (irreversible) structural phase transition under pressure.

Original languageEnglish
Pages (from-to)2681-2686
Number of pages6
JournalJournal of Physics and Chemistry of Solids
Volume69
Issue number11
DOIs
Publication statusPublished - Nov 2008

Keywords

  • High pressure
  • Inorganic compounds
  • Magnetic properties
  • Phase transitions

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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