Dynamic spin interchange in a tridentate Fe(iii ) Schiff-base compound
| Autor: | Ana I. Vicente, Hermínio P. Diogo, Maria Deus Carvalho, Paulo N. Martinho, Maria José Calhorda, Mathieu Duttine, V. H. Rodrigues, Manuel E. Minas da Piedade, Abhinav Joseph, Liliana P. Ferreira |
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| Přispěvatelé: | Centro de Química e Bioquímica, Universidade de Lisboa (ULISBOA), BioISI, Department of Physics [Coimbra], University of Coimbra [Portugal] (UC), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Centro de Quimica Estrutural (CQE), Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), This work was supported by Fundação para a Ciência e a Tecnologia (FCT), Portugal (Projects UID/MULTI/00612/2013 and UID/MULTI/04046/2013). A PhD (SFRH/BD/90386/2012) grant from FCT is gratefully acknowledged by A. Joseph. A postdoctoral grant (SFRH/BPD/73345/2010) from FCT is also gratefully acknowledged by P. N. Martinho. We also acknowledge the COST action CM1305. |
| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Phase transition Schiff base 010405 organic chemistry Spin transition [CHIM.MATE]Chemical Sciences/Material chemistry General Chemistry Crystal structure 010402 general chemistry 01 natural sciences 0104 chemical sciences Crystal chemistry.chemical_compound Crystallography chemistry Anisotropy Spin-½ |
| Zdroj: | Chemical Science Chemical Science, The Royal Society of Chemistry, 2016, 7 (7), pp.4251-4258. ⟨10.1039/c5sc04577k⟩ |
| ISSN: | 2041-6539 2041-6520 |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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