Highly Luminescent Mono‐ and Dinuclear Cationic Iridium(III) Complexes Containing Phenanthroline‐Based Ancillary Ligand

Abstract

A new family of mononuclear (1-2) and dinuclear (3-5) cationic iridium(III) complexes have been synthesized and fully characterized. These complexes contain 2-(4-(trifluoromethyl)phenyl)pyridine (cf 3 ppy, L1) and 1-(4-(trifluoromethyl)phenyl)isoquinoline (cf 3 piq, L2) as cyclometalating ligands, 1,10-phenanthroline (LX-1) as the ancillary ligand and 1,4-bis(1-phenyl-1H-imidazo[4,5-f ][1,10]phenanthrolin-2-yl)benzene (biphen, LX-2) as the bridging ligand. The crystal structure of LX-2 has been determined by X-ray analysis. All of the com- [a]

Multicolor Emissive Phosphorescent Iridium(III) Complexes Containing L-Alanine Ligands: Photophysical and Electrochemical Properties, DFT Calculations, and Selective Recognition of Cu(II) Ions

“…Under 320 nm, the absorption bands of complexes Ir1 – Ir3 with a high molar extinction coefficient in the level of 10 4 L·mol −1 ·cm −1 can be attributed to the spin-allowed singlet ligand-centered ( 1 LC) electronic transitions. The weaker bands in the 320–550 nm ranges are designated for metal-to-ligand (MLCT) and ligand-to-ligand (LLCT) charge transfer [ 24 ]. In 320–550 nm, the lowest energy absorption maxima of Ir2 and Ir3 are blue shifted in comparison with that of complex Ir1 .…”

Influential effect of C^N ligands containing O, S, and Se heteroatoms in the color tuning of four phosphorescent Ir(III) complexes

“…Among them, the development of iridium complexes with various luminescence color including blue, green, yellow, orange, and red light is a most important research direction. In particular, the design of red phosphorescent emitter is more challenging because the luminescence quantum yields decrease as emission wavelength shift to red region on account of the energy gap law [19,20].…”

Structural Diversity in Cyclometalated Diiridium(III) Complexes with Bridging syn and anti μ2‐Oxamidato and μ2‐Dithioxamidato Ligands

“…[12,13] Diiridium complexes are often obtained as a mixture of diastereomers, which are generally not separated. Representative recent examples of organic bridging ligands in diiridium complexes include derivatives of 4,6-diarylpyrimidine, [14] 2-phenylpyrimidine, [15,16] diarylhydrazide, [17,18] pyrazolate, [19,20] bis(phenanthroline) [21] Schiff bases, [22][23][24] pyridazine, [25] butadiene [26] and alkynes. [27] Sünkel et al first reported a diiridium complex bridged by a μ 2 -oxamidato-N,N',O,O' ligand, [28] namely complex 1 and we characterized its analogs 2 a, [29] 2 b [29] and 2 c [30] (Figure 1).…”