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Issue 6, 2013
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Heteroleptic rhodium NHC complexes with pyridine-derived ligands: synthetic accessibility and reactivity towards oxygen

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Abstract

The synthesis, structure determination and oxidative stability of novel Rh–NHC complexes which feature pyridine-derived ligands have been described. All complexes described herein were synthesized from common dinuclear precursors of general structure [Rh(NHC)(L)Cl]2, where L is a monodentate olefin. We demonstrate that the use of these precursors is critical for the formation of all complexes since related cyclooctadiene containing precursors ([Rh(NHC)(COD)Cl]) were completely unreactive under identical conditions. We further demonstrate that complexes with the general formula [Rh(NHC)(olefin)(Py)Cl] or ([Rh(NHC)(BiPy/Phen)Cl]) are extremely sensitive to oxygen, reacting initially to give an adduct with dioxygen, and then decomposing further. The series of compounds and their oxidation products gave a remarkable range of colours which may be useful in the preparation of colourometric oxygen sensors.

Graphical abstract: Heteroleptic rhodium NHC complexes with pyridine-derived ligands: synthetic accessibility and reactivity towards oxygen

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Publication details

The article was received on 28 Jun 2012, accepted on 19 Oct 2012 and first published on 23 Oct 2012


Article type: Paper
DOI: 10.1039/C2DT32095A
Citation: Dalton Trans., 2013,42, 2282-2293
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    Heteroleptic rhodium NHC complexes with pyridine-derived ligands: synthetic accessibility and reactivity towards oxygen

    O. V. Zenkina, E. C. Keske, G. S. Kochhar, R. Wang and C. M. Crudden, Dalton Trans., 2013, 42, 2282
    DOI: 10.1039/C2DT32095A

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