Pressure-induced switching properties of the iron(iii) spin-transition complex [FeIII (3-OMeSalEen)2 ]PF6

Physical Chemistry Chemical Physics : PCCP
J LaisneyM-L Boillot

Abstract

We investigated the effect of an externally applied pressure on the iron(iii) Schiff-base compound [Fe(3-OMeSalEen)2]PF6 (H-3-OMeSalEen, condensation product of 3-methoxy-substituted salicylaldehyde and N-ethylethylenediamine), which at ambient pressure displays a thermal spin transition with a 3 K wide hysteresis loop centered at 164 K. Raman spectrometry revealed the occurrence of a complete spin-state switching process for a pressure of P1/2 = 8-9 kbar at room temperature. The evolution of lattice parameters as a function of pressure was followed by X-ray diffraction measurements on single crystals, highlighting the important microscopic aspects at the origin of the pressure-induced transition, i.e. an anisotropic response and a high compressibility of the HS molecular lattice. Variable temperature magnetic susceptibility measurements at different applied pressures revealed the smoothening of the spin transition curves and a linear increase of the transition temperatures by ca. 16.4 (1.0) K kbar-1, in good agreement with the Clausius-Clapeyron law. The non-negligible influence of the pressure transmitting oils on the intrinsic transition properties was also evidenced and attributed to mechanical interactions between the part...Continue Reading

References

Jun 16, 2005·Dalton Transactions : an International Journal of Inorganic Chemistry·Jośe Antonio RealM Carmen Muñoz
Aug 8, 2009·Physical Review Letters·Cristian EnachescuAndreas Hauser
Sep 22, 2011·Chemical Communications : Chem Comm·Yousuf RazaTalal Mallah
Mar 10, 2012·Physical Chemistry Chemical Physics : PCCP·Helena J ShepherdGábor Molnár
Mar 13, 2012·Angewandte Chemie·Helena J ShepherdAzzedine Bousseksou
Jul 14, 2016·Physical Chemistry Chemical Physics : PCCP·Cristian Enachescu, Andreas Hauser
Nov 25, 2017·Advanced Materials·Gábor MolnárAzzedine Bousseksou

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Citations

Mar 12, 2019·Physical Chemistry Chemical Physics : PCCP·Roman BertoniMaciej Lorenc
Jun 20, 2018·Journal of the American Chemical Society·Mirko MikolasekAzzedine Bousseksou

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Methods Mentioned

BETA
X-ray
single crystal diffraction

Software Mentioned

CrysAlisPro

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