期刊
CHEMISTRYSELECT
卷 6, 期 8, 页码 1777-1781出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.202004750
关键词
Iridium complexes; Oxygen-Bridged; Polycyclic; Phosphorescent; Photophysics
资金
- National Natural Science Foundation of China [22001097, 51672114]
- Natural Science Foundation of Jiangsu Province of China [BK20201003]
The new yellow phosphorescent iridium(III) complex Ir(ppybop)(2)acac showed improved emission characteristics and solubility compared to the classical green complex Ir(ppy)(2)acac. The strong electron-donating ability of the unit led to unusual ligand-to-metal charge transfer excited state characteristics, providing a new strategy for designing phosphorescent iridium(III) complexes.
A new yellow phosphorescent iridium(III) complex Ir(ppybop)(2)acac with two oxygen-bridged triphenylamine units were prepared and investigated. The cyclometalating ligand ppybop was synthesized by the efficient Suzuki-Miyaura cross-coupling reaction of oxygen-bridged triarylamine unit based boron reagent 1-a and 2-(4-Bromophenyl)pyridine, and the acetylacetone (acac) was used as an auxiliary ligand. Notably, the complex Ir(ppybop)(2)acac measured with a fluorescence spectrophotometer can show a larger redshift emission (lambda(em)=568 nm), a narrower full width at half maximum (FWHM=59 nm), a longer emission lifetime (tau([b])=3127 ns) and a better solubility in comparison with the classical green complex Ir(ppy)(2)acac (lambda(em)=520 nm, FWHM=70 nm, tau([b])=1206 ns). In addition, the DFT calculation results indicate that the strong electron-donating ability of the unit can lead to the unusual ligand-to-metal charge transfer ((LMCT)-L-3) excited state characteristics of Ir(ppybop)(2)acac, which is completely different from the metal-to-ligand charge transfer ((MLCT)-M-3) in Ir(ppy)(2)acac. This result can provide a new strategy for the design of new phosphorescent iridium(III) complexes.
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