Synthesis and photoluminescence of iridium(III) arylacetylide complexes with acetylide-localized emissive excited states.

ABSTRACT: Herein, we report a series of three bis-cyclometalated iridium(III) complexes each bearing an arylacetylide and an N-heterocyclic carbene (NHC) ligand. The cyclometalating ligand is 2-(2,4-difluorophenyl)pyrazole (F₂ppz), chosen to ensure the 5d(Ir) → π*(F₂ppz) ³MLCT excited-state is higher in energy than the ³(π → π*) state of the acetylide, allowing luminescence to originate from the latter. The strong-field NHC is included to alleviate photoluminescence (PL) quenching caused by the thermal population of the triplet metal-centered (³MC) states, but nevertheless, the three compounds are weakly luminescent. The parent phenylacetylide complex only emits blue luminescence in dichloromethane solution at 77 K, with a peak wavelength of 424

SUBMITTER: Phan SNT 

PROVIDER: S-EPMC12836165 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature