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Jeremy A Intrator1, Nicholas M Orchanian1, Andrew J Clough1

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This summary is machine-generated.

This study synthesizes trinuclear cobalt complexes with dithiolene ligands, revealing strong electronic coupling between metal centers. These molecular building blocks offer insights into metal-organic frameworks (MOFs) and their electronic properties.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Metal-organic frameworks (MOFs) are complex materials whose properties are difficult to study directly.
  • Molecular building blocks can offer unique characterization opportunities.
  • Trinuclear cobalt complexes with dithiolene ligands are investigated as model systems.

Purpose of the Study:

  • To synthesize and characterize novel trinuclear cobalt dithiolene complexes.
  • To investigate the electronic coupling and redox behavior of these complexes.
  • To explore their potential as molecular building blocks for MOFs.

Main Methods:

  • Single crystal X-ray diffraction for structural analysis.
  • Cyclic voltammetry to study redox properties and mixed valence states.
  • Spectroelectrochemistry to analyze intervalence charge transfer (IVCT) bands.
  • Density Functional Theory (DFT) calculations for electronic structure analysis.

Main Results:

  • Three five-coordinate cobalt centers were observed in a distorted square pyramidal geometry.
  • Complexes exhibited three redox features corresponding to sequential Co(III/II) reduction.
  • Strong resonance-stabilized coupling was found, with complex 2 showing stronger electronic coupling than complex 1.
  • Solvent polarity influenced the stability of mixed valence species.
  • DFT calculations revealed deviations in frontier orbital energies compared to Cp*-ligated analogues.

Conclusions:

  • The synthesized trinuclear cobalt dithiolene complexes serve as valuable molecular building blocks.
  • Their electronic properties, including strong metal-metal coupling, are well-defined.
  • These findings contribute to understanding the fundamental electronic behavior relevant to MOF design.