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

Ana I Vicente1, Abhinav Joseph1, Liliana P Ferreira2,3

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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.

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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.