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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Chemically Separable Co(II) Spin-State Isomers.

Amelia M Wheaton1, Jill A Chipman1, Rebecca K Walde1

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, Wisconsin 53706, United States.

Journal of the American Chemical Society
|September 19, 2024
PubMed
Summary
This summary is machine-generated.

Researchers report the first physically separable cobalt(II) spin-state isomers. These distinct isomers, arising from a Mo-Co complex, can be isolated due to differences in solubility and interconversion rates.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Spin crossover (SCO) complexes exhibit switchable spin states and geometric changes.
  • SCO isomers typically interconvert rapidly and are difficult to separate due to similar polarity.

Purpose of the Study:

  • To report the first example of physically separable cobalt(II) spin-state isomers.
  • To characterize these isomers and understand the factors enabling their separation.

Main Methods:

  • Synthesis of heterometallic Mo-Co compounds.
  • SQUID magnetometry and EPR spectroscopy for spin state determination.
  • X-ray crystallography to analyze geometric differences.
  • Solubility studies and NMR, EPR, UV-vis spectroscopy for solution behavior.

Main Results:

  • Successfully synthesized and isolated two distinct cobalt(II) spin-state isomers (SC-2 and HS-2) with identical composition (Mo2Co(dpa)4Br2).
  • SC-2 exhibits an S=1/2 to S=3/2 spin transition, while HS-2 has a ground state of S=3/2.
  • Geometric differences, specifically Co-Br bond length, and resulting solubility variations enabled physical separation.
  • Isomers interconvert slowly in solution, with solvent polarity influencing the predominant form.

Conclusions:

  • Demonstrated the first physical separation of cobalt(II) spin-state isomers.
  • Highlighted the role of geometric and solubility differences in isomer separation.
  • Showcased solvent-dependent isomer populations, offering new avenues for controlling SCO behavior.