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Panchromatic Gold Alkynyl Complexes with Pyrenyl-N-Heterocyclic Carbene Ligand Displaying Anti-Kasha Behavior
Yaping Cheng1, Lilith Ünal2, Geoffrey Gontard1
1Sorbonne Université-Faculté des Sciences et Ingénerie Campus Pierre et Marie Curie, CNRS, IPCM (UMR 8232), 4 place Jussieu, Paris cedex 05, 75252, France.
Angewandte Chemie (International Ed. in English)
|October 17, 2025
Summary
New gold(I)-alkynyl complexes with pyrenyl-N-heterocyclic carbene ligands exhibit unique multi-emissive and panchromatic behaviors, offering potential for optical applications.
Area of Science:
- Organometallic Chemistry
- Photophysics
- Materials Science
Background:
- N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
- Gold(I)-alkynyl complexes are of interest due to their unique electronic and photophysical properties.
Purpose of the Study:
- To synthesize and characterize novel alkynyl-gold(I)-complexes featuring a pyrenyl-NHC ligand.
- To investigate the influence of different N-substituents on the photophysical properties of these complexes.
- To explore potential applications in the optical domain.
Main Methods:
- Synthesis and full characterization of alkynyl-gold(I)-complexes (1-6) and a cyanide-gold(I) complex (7).
- X-ray diffraction studies for structural elucidation of selected complexes (3, 4, and 7).
- Photophysical characterization, including emission spectroscopy and TD-DFT calculations.
Main Results:
- Alkynyl complexes displayed distinct emission properties compared to the weakly fluorescent cyanide complex.
- Complex 1 showed excimer emissions from the pyrene moiety.
- Complexes 2-6 exhibited remarkable multi-emissive and panchromatic behavior, with emissions dependent on excitation wavelength, suggesting anti-Kasha behavior.
Conclusions:
- The pyrenyl-NHC ligand significantly impacts the photophysical properties of gold(I)-alkynyl complexes.
- The observed multi-emissive and panchromatic behaviors are unprecedented and highly promising.
- These novel gold complexes are potential candidates for advanced optical applications.
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