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Electronically Divergent Triscyclometalated Iridium(III) 2-(1-naphthyl)pyridine Complexes and Their Application in Three-Component Methoxytrifluoromethylation of Styrene

Journal article
Authors R. E. N. Njogu
Peter Fodran
Y. Tian
L. W. Njenga
D. K. Kariuki
A. O. Yusuf
I. Scheblykin
O. F. Wendt
Carl Johan Wallentin
Published in Synlett
Volume 30
Issue 7
Pages 792-798
ISSN 0936-5214
Publication year 2019
Published at Department of Chemistry and Molecular Biology
Pages 792-798
Language en
Links dx.doi.org/10.1055/s-0037-1611716
Keywords iridium catalysis, ligands, naphthylpyridines, oxytrifluoromethylation, photoredox catalysis, styrene
Subject categories Organic Chemistry

Abstract

A systematic study of the photophysical and electrochemical properties of triscyclometalated homoleptic iridium(III) complexes based on 2-(1-naphthyl)pyridine (npy) ligands is presented. A systematic investigation of ligand substitution patterns showed an influence on the lifetime of the excited state, with slight changes in the absorption and emission spectral features. Specifically, the emission lifetime of a complex of an npy ligand substituted with a strongly electron-withdrawing trifluoromethyl group was longer than that of the corresponding complex with the electronically nonperturbed ligand (3.7 μs versus 1.5 μ s). Electronically complementary ligands and complexes with orthogonal configurations showed slightly shorter excited state lifetimes compared with unsubstituted npy (1.4-3.0 μs). All complexes displayed reversible or quasireversible redox-couple processes, with the complex of the trifluoromethylated ligand showing the highest ground-state oxidation potential E 1/2 ox [Ir(III)/Ir(IV) = 0.95 V vs. SCE in CH 2 Cl 2 ]. This study showed that these complexes can be used as efficient photoredox catalysts, as demonstrated by their application in a regioselective methoxytrifluoromethylation in which the npy complexes showed equal or better performance compared with the archetypical photo redox catalyst tris[2-phenylpyridinato]iridium(III). © 2019 Georg Thieme Verlag Stuttgart.

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