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Mononuclear Rh(II) PNP-type complexes. Structure and reactivity.

Moran Feller1, Eyal Ben-Ari, Tarkeshwar Gupta

  • 1Department of Organic Chemistry and Unit of Chemical Research Support, The Weizmann Institute of Science, Rehovot 76100, Israel.

Inorganic Chemistry
|October 2, 2007
PubMed
Summary
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This study synthesized and characterized novel Rhodium(II) complexes, exploring their reactivity with various ligands and redox agents. The research details the formation of Rhodium(I) and Rhodium(III) species through reduction and disproportionation reactions, expanding knowledge of rhodium chemistry.

Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Coordination Chemistry

Background:

  • Rhodium complexes are crucial in catalysis and materials science.
  • Understanding the redox behavior of rhodium is key to developing new synthetic methodologies.
  • The (PNPtBu) ligand system offers unique steric and electronic properties for rhodium coordination.

Purpose of the Study:

  • To synthesize and characterize novel Rhodium(II) mononuclear complexes.
  • To investigate the redox properties and reactivity of these Rhodium(II) complexes.
  • To explore the formation of Rhodium(I) and Rhodium(III) species from Rhodium(II) precursors.

Main Methods:

  • Synthesis of Rhodium(II) complexes via oxidation of Rhodium(I) precursors using silver salts.

Related Experiment Videos

  • Characterization using X-ray diffraction, Electron Paramagnetic Resonance (EPR) spectroscopy, cyclic voltammetry, and dipole moment measurements.
  • Investigation of reactivity through reactions with nitric oxide (NO) gas, phosphines, carbon monoxide (CO), isonitriles, and water.

    • Main Results:

    • Successfully synthesized Rhodium(II) complexes [(PNPtBu)RhCl][BF4] (2), [(PNPtBu)Rh(OC(O)CF3)][OC(O)CF3] (4), and [(PNPtBu)Rh(acetone)][BF4]2 (6).
    • Characterized complexes 2 and 6, and studied their reactions with NO to form diamagnetic Rhodium(II) nitrosyl complexes.
    • Observed reduction of complex 6 to Rhodium(I) and disproportionation of complex 2 to Rhodium(I) and Rhodium(III) species under various conditions, including formation of a Rhodium(III) complex with a coordinated BF4 ligand.

    Conclusions:

    • The synthesized Rhodium(II) complexes exhibit diverse reactivity, undergoing oxidation, reduction, and disproportionation.
    • The (PNPtBu) ligand plays a significant role in stabilizing different oxidation states of rhodium.
    • This work provides insights into the fundamental coordination and redox chemistry of rhodium, with potential implications for catalysis.