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A face-capped [Fe4L4]8+ spin crossover tetrahedral cage.

Alan Ferguson1, Marie A Squire, Diana Siretanu

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A novel iron(II) molecular tetrahedron exhibits thermally driven spin crossover (SCO) behavior. This phenomenon occurs in both solid states and dilute solutions around 284-288 K.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Molecular spin crossover (SCO) is a phenomenon where transition metal complexes switch between low-spin and high-spin states.
  • Iron(II) complexes are widely studied for SCO due to their accessible spin states and diverse coordination environments.
  • Designing discrete supramolecular architectures capable of SCO is a key challenge in molecular materials.

Purpose of the Study:

  • To synthesize and characterize a face-capped iron(II) molecular tetrahedron.
  • To investigate the spin crossover properties of this novel Fe(II) supramolecular assembly.
  • To determine the temperature range and conditions under which spin crossover occurs.

Main Methods:

  • Single crystal X-ray diffraction at variable temperatures (153 K and 293 K).
  • Variable temperature magnetic susceptibility measurements.
  • Synthesis and characterization of the [Fe(4)L(4)](BF(4))(8) complex.

Main Results:

  • The formation of a face-capped Fe(II) molecular tetrahedron, [Fe(4)L(4)](BF(4))(8), was confirmed.
  • Single crystal X-ray diffraction data at 153 K and 293 K indicated potential spin state changes.
  • Variable temperature magnetic susceptibility measurements confirmed thermally driven spin crossover (SCO) behavior.

Conclusions:

  • The synthesized iron(II) molecular tetrahedron exhibits robust spin crossover behavior.
  • SCO is observed in both the solid state and in dilute acetone solution.
  • The spin crossover transition is centered around 284-288 K, demonstrating tunable SCO properties in supramolecular systems.