Issue 33, 2019

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

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

Supplementary files

Article information

Article type
Communication
Submitted
26 Feb 2019
Accepted
25 Mar 2019
First published
25 Mar 2019

Chem. Commun., 2019,55, 4769-4772

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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