Preparation and Photophysical Properties of Bis(tridentate) Iridium(III) Emitters: Pincer Coordination of 2, 6-Di(2-pyridyl)phenyl

Boudreault, Pierre-Luc T. ; Esteruelas, Miguel A. ; Gómez-Bautista, Daniel ; Izquierdo, Susana ; López, Ana M. (Universidad de Zaragoza) ; Oñate, Enrique ; Raga, Esther ; Tsai, Jui-Yi

Resumen: The way to prepare molecular emitters [5t + 4t'] of iridium(III) with a 5t ligand derived from the abstraction of the hydrogen atom at position 2 of the aryl group of 1, 3-di(2-pyridyl)benzene (dpybH) is shown. In addition, the photophysical properties of the new emitters are compared with those of their counterparts resulting from the deprotonation of 1, 3-di(2-pyridyl)-4, 6-dimethylbenzene (dpyMebH), at the same position, which are also synthesized. Treatment of 0.5 equiv of the dimer [Ir(µ-Cl)(¿2-COE)2]2 (COE = cyclooctene) with 1.0 equiv of Hg(dpyb)Cl leads to the iridium(III) derivative IrCl2{¿3-N, C, N-(dpyb)}(¿2-COE) (3), which reacts with 2-(1H-imidazol-2-yl)-6-phenylpyridine (HNImpyC6H5) and 2-(1H-benzimidazol-2-yl)-6-phenylpyridine (HNBzimpyC6H5) in the presence of Na2CO3 to give Ir{¿3-C, N, N-(NImpyC6H4)}{¿3-N, C, N-(dpyb)} (4) and Ir{¿3-C, N, N-(NBzimpyC6H4)}{¿3-N, C, N-(dpyb)} (5), respectively. Similar reactions of the Williams''s dimer [IrCl(µ-Cl){¿3-N, C, N-(dpyMeb)}]2 with HNImpyC6H5 and HNBzimpyC6H5 in the presence of Na2CO3 afford the dimethylated counterparts Ir{¿3-C, N, N-(NImpyC6H4)}{¿3-N, C, N-(dpyMeb)} (6) and Ir{¿3-C, N, N-(NBzimpyC6H4)}{¿3-N, C, N-(dpyMeb)} (7), whereas 2-(6-phenylpyridine-2-yl)-1H-indole (HIndpyC6H5) initially gives IrH{¿2-N, N-(IndpyC6H5)}{¿3-N, C, N-(dpyMeb)} (8) and subsequently Ir{¿3-C, N, N-(IndpyC6H4)}{¿3-N, C, N-(dpyMeb)} (9). Complexes 4-7 are phosphorescent green emitters (¿em 490-550 nm), whereas 9 is greenish yellow emissive (¿em 547-624 nm). They display lifetimes in the range 0.5-9.7 µs and quantum yields in both doped poly(methyl)methacrylate films and in 2-methyltetrahydrofuran at room temperature depending upon the ligands: 0.5-0.7 for 6 and 7, about 0.4 for 4 and 5, and 0.3-0.2 for 9.

Idioma: Inglés

DOI: 10.1021/acs.inorgchem.9b03509

Año: 2020

Publicado en: Inorganic Chemistry 59, 6 (2020), 3838-3849
ISSN: 0020-1669

Factor impacto JCR: 5.165 (2020)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 5 / 45 = 0.111 (2020) - Q1 - T1

Factor impacto SCIMAGO: 1.348 - Chemistry (miscellaneous) (Q1) - Physical and Theoretical Chemistry (Q1) - Inorganic Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E06-17R
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 (PostPrint)

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