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Spin crossover in iron(III) Schiff-base 1-D chain complexes.

Tamsyn M Ross1, Suzanne M Neville, David S Innes

  • 1School of Chemistry, Monash University, VIC, Australia 3800.

Dalton Transactions (Cambridge, England : 2003)
|December 22, 2009
PubMed
Summary

This study explores iron(III) coordination polymers, revealing that the Schiff-base ligand dictates magnetic properties. The salen ligand promotes high spin states, while the acen ligand induces gradual spin crossover behavior.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Iron(III) complexes with Schiff-base ligands are known for diverse structural and magnetic properties.
  • Polymeric coordination materials offer tunable characteristics through ligand design.

Purpose of the Study:

  • To synthesize and characterize a series of 1-D iron(III) polymeric materials.
  • To investigate the influence of equatorial Schiff-base and axial bridging ligands on structural motifs and magnetic behavior.
  • To correlate structural variations with observed magnetic properties, including spin crossover.

Main Methods:

  • Synthesis of iron(III) 1-D polymeric materials with general formula [Fe(III)(Schiff-base)(L)](BPh(4)).n(CH(3)OH).
  • Structural characterization using X-ray diffraction to identify motifs like chains and dimers.
  • Magnetic characterization to study magnetic susceptibility and spin states.

Main Results:

  • Observed structural motifs include linear chains, hydrogen-bonded chains, and dinuclear compounds with extensive intermolecular interactions.
  • The salen Schiff-base ligand consistently resulted in high spin character.
  • The acen Schiff-base ligand exhibited spin crossover character, typically with a gradual transition.
  • Magnetic behavior variations were partly explained by the conformation of the Schiff-base ligand's backbone.

Conclusions:

  • The choice of equatorial Schiff-base ligand is crucial in determining the magnetic properties of these iron(III) polymers.
  • The salen ligand favors high spin states, whereas the acen ligand facilitates spin crossover.
  • Ligand conformation plays a significant role in enabling or inhibiting spin transitions.