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Título: | Alkynyl ligands as building blocks for the preparation of phosphorescent iridium(III) emitters: Alternative synthetic precursors and procedures |
Autor: | Adamovich, Vadim; Benítez, María CSIC; Boudreault, Pierre-Luc T.; Buil, María L. CSIC ORCID; Esteruelas, Miguel A. CSIC ORCID; Oñate, Enrique CSIC ORCID; Tsai, Jui-Yi | Fecha de publicación: | 2022 | Editor: | American Chemical Society | Citación: | Inorganic Chemistry 61(24): 9019-9033 (2022) | Resumen: | Alkynyl ligands stabilize dimers [Ir(μ-X)(3b)2]2 with a cis disposition of the heterocycles of the 3b ligands, in contrast to chloride. Thus, the complexes of this class─cis-[Ir(μ2-η2-C≡CPh){κ2-C,N-(C6H4-Isoqui)}2]2 (Isoqui = isoquinoline) and cis-[Ir(μ2-η2-C≡CR){κ2-C,N-(MeC6H3-py)}2]2 (R = Ph, tBu)─have been prepared in high yields, starting from the dihydroxo-bridged dimers trans-[Ir(μ-OH){κ2-C,N-(C6H4-Isoqui)}2]2 and trans-[Ir(μ-OH){κ2-C,N-(MeC6H3-py)}2]2 and terminal alkynes. Subsequently, the acetylide ligands have been employed as building blocks to prepare the orange and green iridium(III) phosphorescent emitters, Ir{κ2-C,N-[C(CH2Ph)Npy]}{κ2-C,N-(C6H4-Isoqui)}2 and Ir{κ2-C,N-[C(CH2R)Npy]}{κ2-C,N-(MeC6H3-py)}2 (R = Ph, tBu), respectively, with an octahedral structure of fac carbon and nitrogen atoms. The green emitter Ir{κ2-C,N-[C(CH2tBu)Npy]}{κ2-C,N-(MeC6H3-py)}2 reaches 100% of quantum yield in both the poly(methyl methacrylate) (PMMA) film and 2-MeTHF at room temperature. In organic light-emitting diode (OLED) devices, it demonstrates very saturated green emission at a peak wavelength of 500 nm, with an external quantum efficiency (EQE) of over 12% or luminous efficacy of 30.7 cd/A. | Versión del editor: | https://doi.org/10.1021/acs.inorgchem.2c00197 | URI: | http://hdl.handle.net/10261/272936 | DOI: | 10.1021/acs.inorgchem.2c00197 | E-ISSN: | 1520-510X |
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