Bright Circularly Polarized Electrochemiluminescence from Heterobinuclear Ir <sup>III</sup> –Au <sup>I</sup> Enantiomers

The development of efficient circularly polarized electrochemiluminescence (CP-ECL) probes is still at its infancy and examples are still very limited. Yet, their achievement would enable gathering a readout that carries privileged information on the probe's chiral environment by monitoring luminescence polarization bias with high signal-to-noise ratio. Notwithstanding, this is a highly challenging task and requires judicious chemical engineering of chiral ECL-active emitters. Herein, we aim at expanding the palette of CP-ECL luminophores by presenting a novel class of enantiopure heterobinuclear Ir(III)-Au(I) complexes, which are investigated thoroughly by means of chemical, structural, and (chiro-)optical techniques. The ground and excited state properties are also elucidated by using density functional theory (DFT) approaches including spin-orbital coupling (SOC) perturbation. The chiral-at-metal complexes display luminescence with a polarization bias of the emitted light that is function of the helical arrangement of the coordination sphere around the Ir(III) center. Overall, the photo- and electro-active complexes unraveled in this work combine unparallelly high photoluminescence quantum yield in the orange region, excellent circularly polarized luminescence (CPL) brightness up to 4.5 M<sup>-1</sup> cm<sup>-1</sup> with a notable ECL activity. Finally, these features provide emitters with CP-ECL efficiency that encompass remarkably by a factor 3.5 that of the well-known benchmark tris-(2,2'-bipyridyl)ruthenium(II).

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Journal
Angewandte Chemie International Edition
Published
2025-11-13
DOI
https://doi.org/10.1002/anie.202510787
Primary Topic
Synthesis and Properties of Aromatic Compounds
Type
article
Field-Weighted Citation Impact
0.00

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article

Bright Circularly Polarized Electrochemiluminescence from Heterobinuclear Ir III –Au I Enantiomers

Lavinia Ballerini, Matteo Mauro, Francesco Zinna, Stéphane Bellemin‐Laponnaz et al.
Angewandte Chemie International Edition
Synthesis and Properties of Aromatic Compounds
article

Bright Circularly Polarized Electrochemiluminescence from Heterobinuclear Ir III –Au I Enantiomers

Lavinia Ballerini, Matteo Mauro, Francesco Zinna, Stéphane Bellemin‐Laponnaz, Nešo Šojić, Laurent Bouffier, Lorenzo Di Bari, Federico Polo, Vincent César, Silvia Voci, Christophe Gourlaouen, Chantal Daniel, Lorenzo Arrico, Miaoxia Liu
article en

Abstract

The development of efficient circularly polarized electrochemiluminescence (CP-ECL) probes is still at its infancy and examples are still very limited. Yet, their achievement would enable gathering a readout that carries privileged information on the probe's chiral environment by monitoring luminescence polarization bias with high signal-to-noise ratio. Notwithstanding, this is a highly challenging task and requires judicious chemical engineering of chiral ECL-active emitters. Herein, we aim at expanding the palette of CP-ECL luminophores by presenting a novel class of enantiopure heterobinuclear Ir(III)-Au(I) complexes, which are investigated thoroughly by means of chemical, structural, and (chiro-)optical techniques. The ground and excited state properties are also elucidated by using density functional theory (DFT) approaches including spin-orbital coupling (SOC) perturbation. The chiral-at-metal complexes display luminescence with a polarization bias of the emitted light that is function of the helical arrangement of the coordination sphere around the Ir(III) center. Overall, the photo- and electro-active complexes unraveled in this work combine unparallelly high photoluminescence quantum yield in the orange region, excellent circularly polarized luminescence (CPL) brightness up to 4.5 M<sup>-1</sup> cm<sup>-1</sup> with a notable ECL activity. Finally, these features provide emitters with CP-ECL efficiency that encompass remarkably by a factor 3.5 that of the well-known benchmark tris-(2,2'-bipyridyl)ruthenium(II).

Angewandte Chemie International EditionVol. 65(1)
Centre National de la Recherche Scientifique (FR), University of Padua (IT), Ca' Foscari University of Venice (IT), Université de Bordeaux (FR), Université Fédérale de Toulouse Midi-Pyrénées (FR), Université de Versailles Saint-Quentin-en-Yvelines (FR), Institut des Sciences Moléculaires (FR), Institut de Chimie de Strasbourg (FR), Laboratoire de Chimie Moléculaire (FR), Industriale Chimica (Italy) (IT), Laboratoire de Chimie de Coordination (FR), Institut de Physique et Chimie des Matériaux de Strasbourg (FR), Institut de Chimie (FR), European Centre for Living Technology (IT), Institut Polytechnique de Bordeaux (FR), Institut Lavoisier de Versailles (FR)
European Commission, Agence Nationale de la Recherche, Université de Strasbourg, China Scholarship Council, Centre National de la Recherche Scientifique
Openalex Percentile: Top 74%
Synthesis and Properties of Aromatic Compounds
DOIOpen Access PDFOpenAlex
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