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A Multi-Stimuli-Responsive Fe(II) SCO Complex Based on an Acylhydrazone Ligand.

Xiu-Qin Chen1, You-De Cai1, Wei Jiang1

  • 1School of Chemical Engineering , Nanjing University of Science and Technology , 210094 Nanjing , P. R. China.

Inorganic Chemistry
|January 9, 2019
PubMed
Summary

This study presents an iron(II) spin crossover complex that changes properties with protonation. The material exhibits reversible switching, color changes, and magnetic responses to chemicals.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Spin crossover (SCO) complexes are molecular materials exhibiting a reversible switch between low-spin and high-spin states.
  • Acylhydrazone ligands offer versatile coordination environments for metal ions.
  • Functional groups on ligands can impart specific properties and responsiveness to SCO complexes.

Purpose of the Study:

  • To synthesize and characterize a novel Fe(II) spin crossover complex incorporating an acylhydrazone ligand with an amino functional group.
  • To investigate the complex's response to protonation/deprotonation in solid and solution states.
  • To explore the complex's magnetic and solubility behavior in the presence of various chemical stimuli.

Main Methods:

  • Synthesis of an Fe(II) complex with a functionalized acylhydrazone ligand.
  • Characterization using spectroscopic and crystallographic techniques.
  • Investigation of spin state transitions via magnetic susceptibility measurements.
  • Solubility studies in aqueous and organic solvents.
  • Assessment of magnetic response to formaldehyde and different solvent types.

Main Results:

  • Successful preparation of an Fe(II) complex featuring an amino-functionalized acylhydrazone ligand.
  • Demonstration of reversible dissociation/regathering upon protonation/deprotonation in solid and solution.
  • Observation of spin state switching, significant color changes, and altered water solubility.
  • Evidence of distinct magnetic responses to formaldehyde and various protic/nonprotic solvents due to ligand-metal interactions.

Conclusions:

  • The synthesized Fe(II) SCO complex exhibits responsive behavior to external stimuli like pH and chemical analytes.
  • The amino functional group plays a crucial role in mediating the complex's magnetic and solubility properties.
  • This work highlights the potential of functionalized SCO materials for sensing applications.