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Macrocyclic Chromium(III) Catecholate Complexes.

Ashley J Schuman1, Adharsh Raghavan1, Susannah D Banziger1

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.

Inorganic Chemistry
|March 12, 2021
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Summary
This summary is machine-generated.

This study reports on chromium(III) complexes with catecholate and semiquinonate ligands, detailing their synthesis and characterization. The research explores their electrochemical, spectroscopic, and magnetic properties, revealing insights into their electronic structures and redox behavior.

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Area of Science:

  • Coordination Chemistry
  • Inorganic Synthesis
  • Spectroscopy
  • Electrochemistry
  • Magnetochemistry
  • Computational Chemistry

Background:

  • Chromium(III) complexes with macrocyclic ligands are of interest due to their diverse electronic and magnetic properties.
  • Catecholate and semiquinonate ligands offer tunable redox behavior and coordination modes.
  • Understanding the interplay between metal centers and redox-active ligands is crucial for designing functional materials.

Purpose of the Study:

  • To synthesize and characterize novel chromium(III) catecholate and semiquinonate complexes using a specific macrocyclic ligand (HMC).
  • To investigate the structural, electrochemical, spectroscopic, and magnetic properties of these complexes.
  • To elucidate the electronic structure and redox behavior of the Cr(III) complexes and their corresponding ligands.

Main Methods:

  • Synthesis of *cis*-[Cr(HMC)(Cat)]+ complexes via reaction of catechol derivatives with a reduced Cr(III) precursor.
  • Chemical oxidation to generate the corresponding semiquinonate complexes.
  • Structural characterization using single-crystal X-ray diffraction.
  • Electrochemical analysis via cyclic voltammetry.
  • Spectroscopic studies including absorption and time-delayed phosphorescence.
  • Magnetic susceptibility measurements.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • Successful synthesis and structural confirmation of *cis*-chelated Cr(III) catecholate and semiquinonate complexes.
  • Observation of reversible catecholate-to-semiquinonate redox transitions with an electrochemically inert Cr(III) center.
  • Spectroscopic data revealed characteristic transitions for the semiquinonate complex and emission properties from different excited states for catecholate complexes.
  • Magnetic studies indicated distinct spin states (S=3/2 for catecholate, S=1 for semiquinonate) due to antiferromagnetic coupling.
  • DFT calculations provided insights into the electronic structures, particularly the SOMOs and LUMOs.

Conclusions:

  • The study successfully synthesized and characterized a series of Cr(III) complexes featuring catecholate and semiquinonate ligands.
  • The complexes exhibit tunable redox properties and distinct magnetic behaviors influenced by ligand coordination and oxidation state.
  • The findings contribute to the understanding of electron transfer processes and magnetic coupling in Cr-based coordination compounds.