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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Chiral hexanuclear ferric wheels.

John Fielden1, Manfred Speldrich, Claire Besson

  • 1Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.

Inorganic Chemistry
|February 16, 2012
PubMed
Summary
This summary is machine-generated.

Homochiral iron(III) wheels with high optical activity were synthesized. These compounds rapidly react to form a diastereomer, indicating fast exchange processes in mixed chiral systems.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Chiral Materials

Background:

  • Homochiral iron(III) wheels, specifically [Fe(6){(S)-pedea}(6)Cl(6)] and [Fe(6){(R)-pedea)}(6)Cl(6)], are known for their high optical activities and antiferromagnetic properties.
  • The synthesis and characterization of such chiral molecular architectures are crucial for developing advanced functional materials.

Purpose of the Study:

  • To investigate the reactivity and exchange processes of homochiral iron(III) wheels.
  • To synthesize and characterize the diastereomeric product formed from the reaction of enantiomeric iron(III) wheels.

Main Methods:

  • Synthesis of homochiral iron(III) wheels using (S)- and (R)-phenylethylaminodiethoxide (pedea).
  • Crystallographic characterization of the resulting diastereomer.
  • 1H NMR and UV-vis spectroscopy to study exchange processes.

Main Results:

  • The homochiral iron(III) wheels, denoted as (R)- and (S)-2, were successfully synthesized and exhibited high optical activities and antiferromagnetic exchange.
  • Reaction between the enantiomeric iron(III) wheels led to the formation of the centrosymmetric diastereomer [Fe(6){(S)-pedea}(3){(R)-pedea}(3)Cl(6)], or (RSRSRS)-2.
  • 1H NMR and UV-vis studies revealed that while exchange processes are slow in both homochiral and heterochiral systems individually, the reaction between (R)- and (S)-2 upon combination is rapid.

Conclusions:

  • The study demonstrates the facile formation of a diastereomeric iron(III) wheel from its homochiral precursors.
  • The findings highlight a significant difference in reaction rates, with rapid exchange occurring only when both enantiomers are combined, suggesting potential applications in chiral sensing or separation.