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Dynamic spin interchange in a tridentate Fe(iii) Schiff-base compound
Ana I Vicente1, Abhinav Joseph1, Liliana P Ferreira2,3
1Centro de Química e Bioquímica , Faculdade de Ciências , Universidade de Lisboa , Campo Grande , 1749-016 Lisboa , Portugal .
Chemical Science
|August 30, 2018
Summary
This study reveals a novel spin transition compound exhibiting the thermosalient effect, where crystals explode due to thermally induced structural changes. This discovery links spin transitions with crystal-shattering thermosalient behavior.
Area of Science:
- Materials Science
- Crystallography
- Physical Chemistry
Background:
- The thermosalient effect, characterized by crystal movement during phase transitions, is rare and poorly understood.
- Spin transition phenomena in metal compounds involve changes in electronic spin states triggered by external stimuli.
Purpose of the Study:
- To synthesize and characterize a new iron(III) compound exhibiting both spin transition and thermosalient behavior.
- To investigate the relationship between spin transitions and the thermosalient effect in crystalline materials.
Main Methods:
- Synthesis and characterization of the [Fe(5-Br-salEen)2][ClO4] compound.
- Magnetic, calorimetric, and X-ray diffraction studies.
- Microscopy and computational modeling.
Main Results:
- The synthesized Fe(III) compound displays a coupled spin transition and thermosalient effect around 320 K.
- An anisotropic unit cell change, preserving crystal symmetry, induces significant lattice stress leading to crystal explosion.
- The phenomenon is attributed to a diffusionless, distortive structural perturbation.
Conclusions:
- This work reports the first instance of a thermosalient effect linked to a spin transition in an Fe(III) compound.
- The findings provide insights into the mechanisms driving coupled spin transitions and thermosalient phenomena.
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