biostudies-literatureXing YEducation Department of Shaanxi ProvinceNational Natural Science Foundation of China15370-15380https://www.ebi.ac.uk/biostudies/studies/S-EPMC9064210biostudies-literatureUnknown9(27)Three Ir(iii) complexes IrC1, IrC2, and IrC3 substituted with 4-(diphenylamino)phenyl (TPA), 4-(9H-carbazol-9-yl)phenyl (Cz1), and 9-phenyl-9H-carbazol-3-yl (Cz2) moieties were prepared and fully characterized as phosphorescent emitters. In comparison with Ir(ppy)3, introduction of TPA, Cz1, and Cz2 moieties strongly improved the oxygen sensitivities of IrC1-IrC3. Short-decayed IrC1 with I 0/I 100 of 168.6 and K app SV of 202.2 bar-1 in THF exhibited the highest sensitivity for oxygen. TPA and Cz moieties caused remarkable collision radius variations of the Ir(iii) complexes with 2.13 ± 0.08 for σ IrC1/σ Ir(ppy)3 , 1.24 ± 0.06 for σ <subRSC advancesThe dependence of oxygen sensitivity on the molecular structures of Ir(iii) complexes and their application for photostable and reversible luminescent oxygen sensing.PMC906421017JS03421703135Li XDi LYang ZQiao CLi CXing YLi FWang HfalseThe dependence of oxygen sensitivity on the molecular structures of Ir(iii) complexes and their application for photostable and reversible luminescent oxygen sensing.Three Ir(iii) complexes IrC1, IrC2, and IrC3 substituted with 4-(diphenylamino)phenyl (TPA), 4-(9H-carbazol-9-yl)phenyl (Cz1), and 9-phenyl-9H-carbazol-3-yl (Cz2) moieties were prepared and fully characterized as phosphorescent emitters. In comparison with Ir(ppy)3, introduction of TPA, Cz1, and Cz2 moieties strongly improved the oxygen sensitivities of IrC1-IrC3. Short-decayed IrC1 with I 0/I 100 of 168.6 and K app SV of 202.2 bar-1 in THF exhibited the highest sensitivity for oxygen. TPA and Cz moieties caused remarkable collision radius variations of the Ir(iii) complexes with 2.13 ± 0.08 for σ IrC1/σ Ir(ppy)3 , 1.24 ± 0.06 for σ <sub2019-01-01T00:00:00Z2019 May2025-04-04T12:43:53.282Z2025-04-04T12:43:53.282ZS-EPMC90642103551482310.1039/c9ra02277e