Coordination Chemistry of Iridium Phosphine–Sulfonate Complexes

  • Nadia G. Leonard
  • Grace V. Parker
  • Paul G. Williard
  • Wesley H. Bernskoetter
Article
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Abstract

A family of new iridium phosphine–sulfonate complexes based on 2-dicyclohexylphosphino-4-benzenesulfonic acid was synthesized and characterized. An iridium(I) phosphine–sulfonate cyclooctadiene species was prepared from transmetalation of a silver salt of the phosphine–sulfonate ligand and iridium(I) cyclooctadiene chloride dimer. This diolefin iridium complex was found to be a functional precatalyst for cyclopentene hydrogenation. A corresponding iridium(I) phosphine–sulfonate dicarbonyl species was prepared by ligand substitution using carbon monoxide. Analysis by infrared spectroscopy established this metal–ligand platform as a relatively electron poor coordination environment. The iridium(I) phosphine–sulfonate cyclooctadiene species was further utilized as a precursor for the synthesis of two iridium(III) phosphine–sulfonate hydride compounds by treatment with strong acids.

Keywords

Phosphine–sulfonate Iridium Coordination chemistry Hydrogenation 
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Notes

Acknowledgments

Financial support by Brown University and the American Chemical Society Petroleum Research Fund (52066-DNI3) is gratefully acknowledged. N.G.L also thanks Brown University for a Summer Undergraduate Teaching and Research Award.

Supplementary material

10904_2013_9966_MOESM1_ESM.txt (4 mb)
Supplementary material 1 (TXT 4099 kb)

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Nadia G. Leonard
    • 1
  • Grace V. Parker
    • 1
  • Paul G. Williard
    • 1
  • Wesley H. Bernskoetter
    • 1
  1. 1.Department of ChemistryBrown UniversityProvidenceUSA

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