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Related Concept Videos

Cooperative Allosteric Transitions01:58

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Mapping the cooperativity pathways in spin crossover complexes.

Matthew G Reeves1, Elodie Tailleur2, Peter A Wood3

  • 1Centre for Science at Extreme Conditions, EaStCHEM School of Chemistry, The University of Edinburgh King's Buildings, West Mains Road Edinburgh Scotland EH9 3FJ UK S.Parsons@ed.ac.uk.

Chemical Science
|June 24, 2021
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Summary
This summary is machine-generated.

Spin crossover (SCO) transitions in iron complexes show a linear relationship between abruptness and changes in intermolecular interaction energies. This finding helps visualize cooperativity pathways in crystal structures.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Spin crossover (SCO) complexes exhibit transitions between high-spin and low-spin states.
  • Understanding cooperativity in SCO is crucial for material applications.
  • Intermolecular interactions significantly influence SCO behavior in crystals.

Purpose of the Study:

  • To quantitatively link SCO transition cooperativity to intermolecular interactions.
  • To explore the relationship between crystal packing and SCO transition abruptness.
  • To develop methods for visualizing cooperativity pathways in SCO materials.

Main Methods:

  • Crystal packing energy calculations were performed on the [Fe(PM-L)2(NCS)2] family of SCO complexes.
  • Analysis focused on interaction energy changes within the first molecular coordination sphere.
  • Transition abruptness was correlated with calculated intermolecular interaction energy variations.

Main Results:

  • A linear correlation was found between SCO transition abruptness and the sum of interaction energy changes.
  • Abrupt transitions are linked to significant stabilizing and destabilizing intermolecular energy shifts.
  • A normalized plot revealed clustering of complexes with similar transition abruptness across different SCO classes.

Conclusions:

  • Intermolecular interactions are key determinants of SCO transition cooperativity and abruptness.
  • Energy difference frameworks provide a useful visualization of SCO cooperativity pathways.
  • The study offers insights into rational design of SCO materials with tailored transition properties.