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

作者：Vicente Ana I; Joseph Abhinav; Ferreira Liliana P; Carvalho Maria de Deus; Rodrigues Vitor H N; Duttine Mathieu; Diogo Herminio P; Minas da Piedade Manuel E; Calhorda Maria Jose; Martinho Paulo N^*

来源：Chemical Science, 2016, 7(7): 4251-4258.

DOI：10.1039/c5sc04577k

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.

• 出版日期2016