Article révisé par les pairs
Résumé : The photophysical properties of gold(I) N‐heterocyclic carbene (NHC) complexes incorporating 2‐ethynyltriphenylene chromophores were investigated in solution and in confined micellar environments. Two series of complexes were synthesized, differing in the nature of the NHC ligand (imidazole or benzimidazole) and the length of the alkyl lateral substituents. The structural and electronic properties of the compounds were characterized by single‐crystal X‐ray diffraction, NMR, absorption, and emission spectroscopies. The complexes exhibited dual fluorescence and phosphorescence emissions in solutions, with enhanced phosphorescence in concentrated samples due to enhanced intersystem crossing (ISC) efficiency. Encapsulation within cetyltrimethylammonium chloride (CTACl) micelles, confirmed via fluorescence microscopy, cryo‐TEM and DOSY NMR, led to modifications in the emission profile, favoring fluorescence over phosphorescence due to steric restrictions on aggregation. This study highlights the sensitivity of the luminescent properties of gold(I) complexes to their environment and their tunability through micellar confinement.

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