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Au(I)-Ynaminyl Complexes for Photocatalysis
Nestor Bracho Pozsoni1, Yi-Jyun Lien2,3, Sayan Dutta4
1Department of Chemistry and Centre for Sustainable Chemistry, Ghent University, Krijgslaan 289, S-3, Ghent9000, Belgium.
Abstract:
A series of gold(I) complexes featuring a novel ligand-gold-ynaminyl architecture was synthesized and characterized. The incorporation of a (carbazolyl)ethynide (C≡C-Cbz) ligand connects the photonic functionality of the carbazolyl with the N-heterocyclic carbene (NHC) through a long ethynide-Au bridge, showing shorter radiative lifetimes and higher ET values in solution in comparison to their carbene-metal-amido (CMA) congeners. The photophysical properties of the NHC complexes reveal a broad UV emission band when measured at room temperature and a hidden phosphorescence band with high quantum yield (up to 94%) at 77 K. This new photonic functional group based on polar ynamines is presented as a versatile platform for the design of high-energy gold-based luminophores with applications in photocatalysis.
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