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Updated: Mar 29, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
A Stable Coordination Complex of Rh(IV) in an N,O-Donor Environment
Shashi B Sinha1, Dimitar Y Shopov1, Liam S Sharninghausen1
1Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States.
Abstract:
We describe facial and meridional isomers of [Rh(III)(pyalk)3], as well as meridional [Rh(IV)(pyalk)3](+) {pyalk =2-(2-pyridyl)-2-propanoate}, the first coordination complex in an N,O-donor environment to show a clean, reversible Rh(III/IV) redox couple and to have a stable Rh(IV) form, which we characterize by EPR and UV-visible spectroscopy as well as X-ray crystallography. The unprecedented stability of the Rh(IV) species is ascribed to the exceptional donor strength of the ligands, their oxidation resistance, and the meridional coordination geometry.
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