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

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 −1 cm −1 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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BibTeX RIS

BibTeX

@article{ballerini2026bright,
  title = {{Bright Circularly Polarized Electrochemiluminescence from Heterobinuclear Ir III –Au I Enantiomers}},
  author = {Lavinia Ballerini and Miaoxia Liu and Lorenzo Arrico and Silvia Voci and Christophe Gourlaouen and Chantal Daniel and Vincent César and Stéphane Bellemin-Laponnaz and Francesco Zinna and Laurent Bouffier and Federico Polo and Lorenzo Di Bari and Neso Sojic and Matteo Mauro},
  journal = {Angewandte Chemie International Edition},
  year = {2026},
  month = oct,
  doi = {10.1002/anie.202510787},
  url = {https://hal.science/hal-05381005v1},
  note = {CC BY-NC 4.0},
}

RIS

TY  - JOUR
TI  - Bright Circularly Polarized Electrochemiluminescence from Heterobinuclear Ir III –Au I Enantiomers
AU  - Lavinia Ballerini
AU  - Miaoxia Liu
AU  - Lorenzo Arrico
AU  - Silvia Voci
AU  - Christophe Gourlaouen
AU  - Chantal Daniel
AU  - Vincent César
AU  - Stéphane Bellemin-Laponnaz
AU  - Francesco Zinna
AU  - Laurent Bouffier
AU  - Federico Polo
AU  - Lorenzo Di Bari
AU  - Neso Sojic
AU  - Matteo Mauro
PY  - 2026
DA  - 2026/10/06
JO  - Angewandte Chemie International Edition
DO  - 10.1002/anie.202510787
UR  - https://hal.science/hal-05381005v1
AB  - 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 −1 cm −1 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).
SN  - 1433-7851
SN  - 1521-3773
ER  -

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