Phosphorescent Iridium(III) Complexes with a Dianionic C,C',N,N'-Tetradentate Ligand

Llorenç Benavent; Pierre-Luc T Boudreault; Miguel A Esteruelas; Ana M López; Enrique Oñate; Jui-Yi Tsai

doi:10.1021/acs.inorgchem.0c01377

Phosphorescent Iridium(III) Complexes with a Dianionic C,C',N,N'-Tetradentate Ligand

Inorg Chem. 2020 Sep 8;59(17):12286-12294. doi: 10.1021/acs.inorgchem.0c01377. Epub 2020 Aug 28.

Authors

Llorenç Benavent¹, Pierre-Luc T Boudreault², Miguel A Esteruelas¹, Ana M López¹, Enrique Oñate¹, Jui-Yi Tsai²

Affiliations

¹ Departamento de Quı́mica Inorgánica, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
² Universal Display Corporation, Ewing, New Jersey 08618, United States.

PMID: 32856908
DOI: 10.1021/acs.inorgchem.0c01377

Abstract

To prepare new phosphorescent iridium(III) emitters, 2-phenyl-6-(1-phenyl-1-(pyridin-2-yl)ethyl)pyridine (H₂L) has been designed and its reactions with [Ir(μ-Cl)(η⁴-COD)]₂ (1, COD = 1,5-cyclooctadiene) have been studied. The products obtained depend on the refluxing temperature of the solvent. Thus, complexes Ir(κ⁴-C,C',N,N'-L)Cl(CO) (2), [Ir(η⁴-COD)(κ²-N,N'-H₂L)][IrCl₂(η⁴-COD)] (3), and [Ir(μ-Cl)(κ⁴-C,C',N,N'-L)]₂ (4) have been formed in 2-ethoxyethanol, propan-2-ol, and 1-phenylethanol, respectively. Complex 4 reacts with K(acac) to give the acetylacetonate derivative Ir(κ⁴-C,C',N,N'-L)(acac) (5). Complexes 2 and 5 are efficient blue-green and green emitters of classes [6tt+1m+2m] and [6tt+3b], respectively. They display lifetimes in the range of 1.1-4.5 μs and high quantum yields (0.54-0.87) in both PMMA films and 2-MeTHF at room temperature.