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Relaxing amid Three: Slow Magnetization Relaxation in Three-Coordinate Chromium(II) N-Heterocyclic Carbene Complexes.

Gabriela Handzlik1, Irene Ligielli2, Sakshi Nain3

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Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 24, 2025
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Summary

This study details the synthesis and characterization of three-coordinate chromium(II) complexes with varying geometries and magnetic properties. These paramagnetic chromium complexes exhibit slow magnetization relaxation, offering insights into single-molecule magnet behavior.

Keywords:
EPR spectroscopyMagnetic propertiescarbene ligandschromiumcomputational chemistry

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Area of Science:

  • Coordination Chemistry
  • Inorganic Chemistry
  • Magnetochemistry

Background:

  • Three-coordinate, paramagnetic chromium(II) complexes are of interest for their unique electronic and magnetic properties.
  • Understanding the relationship between coordination geometry, ligand environment, and magnetic behavior is crucial for designing new magnetic materials.

Purpose of the Study:

  • To synthesize and characterize novel three-coordinate chromium(II) complexes with N-heterocyclic carbene (NHC) and amido ligands.
  • To investigate the structural diversity and magnetic properties, including zero-field splitting and slow magnetization relaxation, of these complexes.
  • To correlate structural features with observed magnetic behavior and compare with related chromium(II) systems.

Main Methods:

  • Synthesis of chromium(II) complexes via substitution, aminolysis, and thermolysis reactions.
  • Structural characterization including determination of coordination geometries.
  • High-Field Electron Paramagnetic Resonance (HFEPR) spectroscopy to determine spin Hamiltonian parameters (zero-field splitting and g-values).
  • AC magnetometry to study magnetization relaxation dynamics.
  • Ab initio calculations to compute zero-field splitting values.

Main Results:

  • Successful synthesis of five S=2 chromium(II) complexes with diverse geometries (trigonal planar, Y-shaped, T-shaped).
  • HFEPR spectroscopy provided accurate spin Hamiltonian parameters, with zero-field splitting (D) ranging from -2.98 to -1.63 cm⁻¹.
  • Three complexes exhibited slow magnetization relaxation, indicative of potential single-molecule magnet behavior, explained by Raman or combined Raman-Orbach processes.
  • Ab initio calculations showed good agreement with experimental zero-field splitting values.

Conclusions:

  • The nature of NHC and amido ligands significantly influences the coordination geometry and magnetic properties of three-coordinate chromium(II) complexes.
  • These complexes represent a valuable family for studying magnetostructural relationships in low-coordinate chromium systems.
  • The observed slow magnetization relaxation highlights the potential of these compounds in the field of molecular magnetism.