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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Solid-State Chemistry

Background:

  • Spin-crossover (SCO) compounds exhibit distinct high-spin and low-spin states.
  • Post-synthetic modification offers a route to tune SCO properties.
  • Iron(II) complexes with triazole ligands are well-studied SCO systems.

Purpose of the Study:

  • To investigate the post-synthetic reaction between p-anisaldehyde and [Fe(NH2-trz)3](NO3)2.
  • To control the degree of transformation by adjusting reaction time.
  • To characterize the resulting SCO complexes and compare their properties with directly synthesized materials.

Main Methods:

  • Post-synthetic modification of [Fe(NH2-trz)3](NO3)2 with p-anisaldehyde.
  • Variable reaction time to achieve different conversion percentages.
  • Characterization using magnetometry, powder X-ray diffraction (PXRD), elemental analysis, solid-state NMR, and IR spectroscopy.

Main Results:

  • Achieved transformation degrees ranging from 23% to full conversion.
  • Demonstrated successful post-synthetic modification of the SCO compound.
  • Identified novel spin crossover properties in the modified complexes.
  • Comparison revealed differences between post-synthetically modified and directly synthesized compounds.

Conclusions:

  • Post-synthetic modification is a viable strategy to tune SCO properties.
  • Reaction time is a critical parameter for controlling the extent of modification.
  • The resulting SCO complexes possess unique characteristics compared to their directly synthesized counterparts.