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Article Dans Une Revue Chemical Science Année : 2016

Dynamic spin interchange in a tridentate Fe(III) schiff-base compound

Résumé

The thermosalient effect is still a rare and poorly understood phenomenon, where crystals suddenly jump, bend, twist or explode upon undergoing a thermally activated phase transition. The synthesis and characterisation of the new spin transition Fe(III) compound [Fe(5-Br-salEen)2][ClO4] (salEen = N-ethyl-N-(2-aminoethyl)salicylaldiminate) is described and its thermosalient behaviour reported. It is the first example of a thermosalient effect with a spin transition and magnetic, calorimetric, diffraction, microscopy and computational studies are used to characterise these effects. Both thermosalient effect and spin transition occur around 320 K upon heating and are accompanied by an anisotropic unit cell change with conservation of crystal symmetry that causes a large enough stress of the crystal lattice to induce crystal explosion. This stress can ultimately be traced back to a diffusionless and distortive structural perturbation resulting in a coupled spin transition-thermosalient effect.
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Dates et versions

hal-01383364 , version 1 (10-01-2023)

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Ana I. Vicente, Abhinav Joseph, Liliana P. Ferreira, Maria De Deus Carvalho, Vítor H. N. Rodrigues, et al.. Dynamic spin interchange in a tridentate Fe(III) schiff-base compound. Chemical Science, 2016, 7 (7), pp.4251-4258. ⟨10.1039/c5sc04577k⟩. ⟨hal-01383364⟩
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