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Novel phosphine ligands respond to multiple stimuli like protonation and redox changes. These responsive ligands significantly influence rhodium-catalyzed hydrosilylations, impacting reactivity and selectivity.

Keywords:
bimetallic complexescooperative effectsferrocenophanemetalloligandsstimuli-responsive ligands

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Supramolecular Chemistry

Background:

  • Development of stimuli-responsive materials is crucial for advanced applications.
  • Phosphine ligands are vital in homogeneous catalysis, but designing responsive variants remains challenging.
  • Ferrocene-based ligands offer unique redox properties.

Purpose of the Study:

  • To synthesize and characterize novel multistimuli-responsive phosphine ligands.
  • To investigate the redox behavior of these ligands and their metal complexes.
  • To explore the application of these responsive ligands in rhodium-catalyzed hydrosilylations.

Main Methods:

  • Synthesis of novel phosphine ligands featuring a redox-active [3]dioxaphosphaferrocenophane backbone and a P-bound imidazolin-2-ylidenamino group.
  • Electrochemical studies to investigate redox behavior.
  • Density Functional Theory (DFT) calculations to support experimental findings.
  • Application in rhodium-catalyzed hydrosilylation reactions.

Main Results:

  • Successful synthesis of multistimuli-responsive phosphine ligands.
  • Demonstrated sensitivity of the ligands and their metal complexes to protonation and metal coordination.
  • Experimental and computational evidence of redox activity and its influence.
  • Significant impact of protonation and oxidation on the reactivity and selectivity of Rh-catalyzed hydrosilylations.

Conclusions:

  • The reported phosphine ligands exhibit novel multistimuli-responsive behavior.
  • Protonation and redox events can effectively tune the catalytic performance of metal complexes.
  • These findings open new avenues for designing advanced responsive catalysts.