Issue 1, 2024

Towards catalytic redox-active iridium polypyridyl complex by in situ photosubstitution

Abstract

In this study, we show that the hydrodehalogenation of reductively inert aryl halides is facilitated by the heteroleptic Ir(III) complex [Ir(dF(CF3)ppy)2(dtbbpy)]+ (1) in the presence of N-(tert-butoxycarbonyl)-proline and cesium carbonate under irradiation with blue light. We observed in situ modification of 1 to yield intact (Ir-int) and degraded (Ir-deg) complexes. Ir-int complexes are formed through the functionalization of both the C^N and N^N ligands with α-amino radicals, formed via single-electron-oxidation of cesium carboxylate salt (N-Boc-Pro-OCs) derived from N-(tert-butoxycarbonyl)-proline by the photoexcited Ir complex. In this functionalization, electron-withdrawing fluorine atoms on the dF(CF3)ppy ligands are substituted. The destabilization of the HOMO of the structurally modified Ir-int results in a bathochromic shift of both the excited triplet state absorption and phosphorescence bands when compared to pristine 1. In the presence of excess N-Boc-Pro-OCs, the free Ir-int undergo rapid quenching via excited-state charge-transfer complex formation. The Ir-int˙, after radical ion separation, are responsible for the hydrodehalogenation reaction of aryl halides.

Graphical abstract: Towards catalytic redox-active iridium polypyridyl complex by in situ photosubstitution

Supplementary files

Article information

Article type
Paper
Submitted
07 Jul 2023
Accepted
26 Sep 2023
First published
10 Oct 2023

Catal. Sci. Technol., 2024,14, 66-75

Towards catalytic redox-active iridium polypyridyl complex by in situ photosubstitution

Y. Z. Tan, X. Wu, Y. Lu, S. Chiba and E. K. L. Yeow, Catal. Sci. Technol., 2024, 14, 66 DOI: 10.1039/D3CY00942D

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