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Updated: May 10, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Rhodium and iridium complexes with a new scorpionate phosphane ligand
Angel L Serrano1, Miguel A Casado, José A López
1Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain.
A new hybrid scorpionate ligand, [A2BPN](-), was synthesized and coordinated to rhodium and iridium. This ligand exhibits versatile binding modes, influencing the electronic properties and reactivity of the resulting metal complexes.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Ligand Design
Background:
- Development of novel ligands is crucial for advancing catalysis and materials science.
- Scorpionate ligands offer unique coordination geometries and electronic properties.
- Hybrid ligands combining different donor atoms provide tunable characteristics.
Purpose of the Study:
- To synthesize and characterize a new hybrid scorpionate ligand, [(allyl)2B(CH2PPh2)(Pz)](-) ([A2BPN](-)).
- To investigate the coordination behavior of [A2BPN](-) with rhodium and iridium complexes.
- To explore the structural, spectroscopic, and reactivity aspects of the resulting metal complexes.
Main Methods:
- Straightforward synthesis of the [A2BPN](-) ligand.
- Coordination chemistry studies with rhodium and iridium precursors.
- Spectroscopic analysis (NMR, IR) and X-ray crystallography for structural elucidation.
- Solution studies to investigate ligand dynamics and complex reactivity.
Main Results:
- Rhodium complexes adopt square-planar geometries with κN,κP binding of [A2BPN](-), featuring fluxional behavior of the metallacycle.
- Iridium complexes exhibit a dominant tripodal κN,κP,η(2)-C═C binding mode, with varying degrees of fluxionality depending on ancillary ligands.
- Protonation and reaction with dmad lead to distinct hydride and C-alkyl complexes, showcasing the ligand's versatility.
- The electronic density at the metal center is sensitive to the ligand's coordination mode.
Conclusions:
- The new hybrid scorpionate ligand [A2BPN](-) demonstrates adaptable coordination modes with rhodium and iridium.
- The ligand's binding mode significantly influences the electronic properties and reactivity of the metal complexes.
- This ligand represents a valuable addition to the toolkit for designing novel organometallic compounds.
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