Iridium(I)- and Rhodium(I)-Olefin Complexes Containing an α-Diimine Supporting Ligand.

Authors :: Kovach J
Golisz SR
Brennessel WW
Jones WD
Source :: Organometallics [Organometallics] 2022 Nov 28; Vol. 41 (22), pp. 3167-3174. Date of Electronic Publication: 2022 Apr 05.
Publication Year :: 2022
Abstract: Iridium(I) complexes of the type IrX(olefin)(α-diimine) (α-diimine = 1,4-bis(2,6-xylyl)-2,3-dimethyl-1,4-diaza-1,3-butadiene; X = Cl, I, Me, O <subscript>2</subscript> CCF <subscript>3</subscript> ; olefin = ethylene, cyclooctene (COE)) were synthesized from the readily available precursor [IrCl(COE) <subscript>2</subscript> ] <subscript>2</subscript> . These complexes display unusual <superscript>1</superscript> H NMR spectra and have large UV-vis extinction coefficients. NOESY and HSQC NMR experiments were used to provide rigorous NMR spectral assignments, and IrCl(C <subscript>2</subscript> H <subscript>4</subscript> )(α-diimine), 1 , and IrCl(COE)(α-diimine), 4 , were structurally characterized by X-ray crystallography. The related rhodium complex [RhCl(α-diimine)] <subscript>2</subscript> , 6 , was also synthesized and characterized by NMR and X-ray crystallography. 6 was observed to be in equilibrium with RhCl(C <subscript>2</subscript> H <subscript>4</subscript> )(α-diimine), 7 , under an ethylene atmosphere.<br />Competing Interests: The authors declare no competing financial interest.<br /> (© 2022 The Authors. Published by American Chemical Society.)

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