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Issue 23, 2018
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Pressure-induced switching properties of the iron(III) spin-transition complex [FeIII(3-OMeSalEen)2]PF6

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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 particles and the solidified matrix.

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

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Publication details

The article was received on 13 Apr 2018, accepted on 15 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8CP02376J
Citation: Phys. Chem. Chem. Phys., 2018,20, 15951-15959
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    Pressure-induced switching properties of the iron(III) spin-transition complex [FeIII(3-OMeSalEen)2]PF6

    J. Laisney, H. J. Shepherd, L. Rechignat, G. Molnár, E. Rivière and M.-L. Boillot, Phys. Chem. Chem. Phys., 2018, 20, 15951
    DOI: 10.1039/C8CP02376J

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