Related Experiment Video
Updated: Apr 30, 2026
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Cationic Sulfonium-Based Tripodal Ligand and Its Rh(I) Complexes
Nitsan Barel1, Shrouq Mujahed1, Kamal Uddin Ansari1
1Institute of Chemistry, Edmond Safra Campus, Hebrew University of Jerusalem, Jerusalem, Israel.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 29, 2026
Summary
Researchers developed a novel cationic sulfonium ligand and its rhodium(I) complexes. This new ligand significantly enhances the Lewis acidity of the rhodium center, enabling its application in catalysis.
Area of Science:
- Organometallic Chemistry
- Catalysis
- Coordination Chemistry
Background:
- Development of novel ligands is crucial for advancing transition metal catalysis.
- Sulfonium compounds offer unique electronic properties compared to traditional phosphine or silane ligands.
- Rhodium(I) complexes are versatile catalysts in various organic transformations.
Purpose of the Study:
- To synthesize and characterize the first cationic tripodal sulfonium ligand and its rhodium(I) complexes.
- To investigate the structural, spectroscopic, and electronic properties of these new complexes.
- To explore the catalytic potential of the rhodium(I) sulfonium complex in Lewis acid catalysis.
Main Methods:
- Synthesis and characterization of cationic tripodal sulfonium ligand and Rh(I) complexes.
- Comprehensive structural (X-ray diffraction) and spectroscopic (NMR, IR) analyses.
- Density Functional Theory (DFT) calculations, cyclic voltammetry (CV), and Lewis acidity measurements (Guttman-Becket method).
Main Results:
- Successful synthesis of cationic mono- and bis-Rh(I) complexes with the tripodal sulfonium ligand.
- Systematic trends observed in E-Rh bond lengths and CO stretching frequencies compared to P- and Si-based analogs.
- Significant anodic shift in Rh(I) reduction potential and high Lewis acidity of the sulfonium Rh(I) complex.
- Demonstrated catalytic activity in N-methylindole condensation reactions.
Conclusions:
- The cationic sulfonium ligand imparts unique electronic properties to Rh(I) complexes, enhancing Lewis acidity.
- These findings open new avenues for designing highly active rhodium-based Lewis acid catalysts.
- The developed complexes show promise for applications in organic synthesis and catalysis.
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