Pseudo-Tris(heteroleptic) Red Phosphorescent Iridium(III) Complexes Bearing a Dianionic C, N, C', N'-Tetradentate Ligand

Adamovich V. ; Benavent L. (Universidad de Zaragoza) ; Boudreault P.-L.T. ; Esteruelas M.A. ; López A.M. (Universidad de Zaragoza) ; Oñate E. ; Tsai J.-Y.

Resumen: 1-Phenyl-3-(1-phenyl-1-(pyridin-2-yl)ethyl)isoquinoline (H2MeL) has been prepared by Pd(N-XantPhos)-catalyzed "deprotonative cross-coupling processes"to synthesize new phosphorescent red iridium(III) emitters (601-732 nm), including the carbonyl derivative Ir(¿4-cis-C, C'-cis-N, N'-MeL)Cl(CO) and the acetylacetonate compound Ir(¿4-cis-C, C'-cis-N, N'-MeL)(acac). The tetradentate 6e-donor ligand (6tt') of these complexes is formed by two different bidentate units, namely, an orthometalated 2-phenylisoquinoline and an orthometalated 2-benzylpyridine. The link between the bidentate units reduces the number of possible stereoisomers of the structures [6tt' + 3b] (3b = bidentate 3e-donor ligand), with respect to a [3b + 3b' + 3b¿] emitter containing three free bidentate units, and it permits a noticeable stereocontrol. Thus, the isomers fac-Ir(¿4-cis-C, C'-cis-N, N'-MeL){¿2-C, N-(C6H4-py)}, mer-Ir(¿4-cis-C, C'-cis-N, N'-MeL){¿2-C, N-(C6H3R-py)}, and mer-Ir(¿4-trans-C, C'-cis-N, N'-MeL){¿2-C, N-(C6HR-py)} (R = H, Me) have also been selectively obtained. The new emitters display short lifetimes (0.7-4.6 µs) and quantum yields in a doped poly(methyl methacrylate) film at 5 wt % and 2-methyltetrahydrofuran at room temperature between 0.08 and 0.58. The acetylacetonate complex Ir(¿4-cis-C, C'-cis-N, N'-MeL)(acac) has been used as a dopant for a red PhOLED device with an electroluminescence ¿max of 672 nm and an external quantum efficiency of 3.4% at 10 mA/cm2. © 2021 American Chemical Society.

Idioma: Inglés

DOI: 10.1021/acs.inorgchem.1c01303

Año: 2021

Publicado en: Inorganic Chemistry 60, 15 (2021), 11347-11363
ISSN: 0020-1669

Factor impacto JCR: 5.436 (2021)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 5 / 46 = 0.109 (2021) - Q1 - T1

Factor impacto SCIMAGO: 1.121 - Inorganic Chemistry (Q1) - Chemistry (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E06-20R
Financiación: info:eu-repo/grantAgreement/ES/DGA/LMP148-18
Financiación: info:eu-repo/grantAgreement/ES/MINECO-AEI-FEDER/CTQ2017-82935-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO-AEI-FEDER/RED2018-102387-T

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)