Pd‐Catalyzed Functionalization of the Thenoyltrifluoroacetone Coligands by Aromatic Dyes in Bis(cyclometallated) IrIII Complexes: From Phosphorescence to Fluorescence?­

摘要: The synthesis, characterization and photophysical properties of a series neutral Ir(CN-Meppy)2(OO-tta-Ar) (MeppyH = 4-methyl-2-phenylpyridine; tta thenoyltrifluoroacetonate) complexes containing new functionalized tta-Ar ligands in which the incorporated Ar group is an aromatic dye such as naphthalene, pyrene, naphthalimide or coumarin, are reported. arylated proligands ttaH-Ar readily obtained two steps through Pd-catalyzed C–H bond activation 2-acetylthiophene. In contrast to parent Ir(CN)2(OO) complexes, phosphorescent solution at room temperature, all display fluorescence, phosphorescence emission quenched. Thus, this work shows that incorporation dyes ligand has dramatic influence on resulting Ir complexes.