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Electrically conductive [Fe4S4]-based organometallic polymers.

Kentaro Kadota1, Tianyang Chen2, Eoghan L Gormley1

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Precise control of electronic properties in hybrid organic-inorganic materials is achieved by tailoring molecular components.
  • Electrically conductive metal-organic frameworks (MOFs) typically use single-metal nodes, as metal-oxo clusters hinder conduction due to localized orbitals.
  • Developing metal-cluster nodes with delocalized bonding is key to expanding the tunability of conductive materials.

Purpose of the Study:

  • To create novel conductive materials by employing the [Fe4S4] cluster as a building unit.
  • To overcome limitations in using [Fe4S4] clusters in artificial conductive materials due to a lack of suitable linkers.
  • To enhance electronic communication between clusters through charge-delocalized bonds.

Main Methods:

  • Bridging cuboidal [Fe4S4] clusters with ditopic N-heterocyclic carbene (NHC) linkers.
  • Synthesizing [Fe4S4Cl2(ditopic NHC)] compounds.
  • Measuring electrical conductivity of the synthesized materials.

Main Results:

  • Successfully bridged [Fe4S4] clusters with ditopic NHC linkers via charge-delocalized Fe-C bonds.
  • Achieved a high electrical conductivity of 1 mS cm-1 at 25 °C for [Fe4S4Cl2(ditopic NHC)].
  • Demonstrated enhanced electronic communication between the [Fe4S4] clusters.

Conclusions:

  • Synthetic control over individual bonds is critical for designing long-range electronic behavior in semiconductors.
  • The use of [Fe4S4] clusters with NHC linkers offers a new pathway for creating highly conductive materials.
  • This approach expands the structural and electrochemical tunability of conductive coordination materials.