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Issue 33, 2019
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Drastic lattice softening in mixed triazole ligand iron(II) spin crossover nanoparticles

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Abstract

A series of spin-crossover (SCO) coordination nanoparticles (ca. 60 nm) with the general formulae [Fe(Htrz)1+yx(trz)2−y(NH2trz)x](BF4)y·nH2O (x = 0, 0.1, 0.2 and 0.3) were synthesized in concentrated solutions without using any surfactant or polymer. The nanoparticle powders were investigated by transmission electron microscopy, powder X-ray diffraction, magnetometry, calorimetry, Raman/IR spectroscopies, elemental analysis and 57Fe Mössbauer spectrometry. Remarkably, the latter revealed a large decrease of the lattice stiffness when incorporating a small amount of amino-triazole ligand, reflected by the drop of the Debye temperature from 285 K (x = 0) to 205 K (x = 0.3). This collapse of the lattice cohesion was attributed to a reorganization of the supramolecular interactions between the Fe-triazole chains. This effect on the SCO properties is also discussed.

Graphical abstract: Drastic lattice softening in mixed triazole ligand iron(ii) spin crossover nanoparticles

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Publication details

The article was received on 26 Feb 2019, accepted on 25 Mar 2019 and first published on 25 Mar 2019


Article type: Communication
DOI: 10.1039/C9CC01619H
Chem. Commun., 2019,55, 4769-4772

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    Drastic lattice softening in mixed triazole ligand iron(II) spin crossover nanoparticles

    M. Piedrahita-Bello, K. Ridier, M. Mikolasek, G. Molnár, W. Nicolazzi, L. Salmon and A. Bousseksou, Chem. Commun., 2019, 55, 4769
    DOI: 10.1039/C9CC01619H

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