Electrochemistry and absorption and emission spectroscopy of new orthometalated complexes of rhodium(III) and iridium(III) with the ligands 1,4,5,8-tetraazaphenanthrene and 1,4,5,8,9,12-hexaazatriphenylene

A Series of Red‐Light‐Emitting Ionic Iridium Complexes: Structures, Excited State Properties, and Application in Electroluminescent Devices

“…The absence of a significant blueshift in the emission from room-temperature fluid solutions to low-temperature rigid glass suggests that the 3 LC character, which is much less sensitive to changes in the surrounding media, contributes greatly to the excited state of the complexes besides the 3 CT character. [32][33][34][35][36][37][38][39][40][41][42][43][44][45] A similar behavior was observed for the [Ir(ppy) 2 bpy] + complex. [46] The emission spectra of complexes in CH 3 CN solutions at 298 K are shown in Figure 5.…”

“…[33,34] It is assumed that pure metal-centered oxidation is reversible, and irreversibility increases as the contribution to the HOMO of the cyclometalating phenyl(s) increases. [35] On such a basis, we assigned the irreversible oxidation processes to orbitals that received a strong contribution from the Ir-C σ-bond orbitals.…”

Study of half sandwich platinum group metal complexes containing tetradentate N-donor ligand bearing two di-pyridylamine units linked by an aromatic spacer

“…and 7, have been assigned to ligand-centered p / p * /n / p * transitions [34,35]. In general, these complexes follow the normal trends observed in the electronic spectra of the nitrogen-bonded metal complexes, which display a ligand-based p / p * transition for pyrazolyl pyridazine ligands in the UV region and metal to ligand charge transfer transitions in the visible region.…”

Photophysical Properties of Oligo­(phenylene ethynylene) Iridium(III) Complexes Functionalized with Metal‐Anchoring Groups

“…The irreversibility of this process denotes the participation of the ppy moiety in the redox process, as supported by previous reports and our theoretical calculations (see below). [48,49] Although the oxidation is more irre-versible for the acetylthiol-terminated compounds Ir1 and Ir2 than for the pyridine-terminated derivatives Ir3 and Ir4, this may only reflect the different tendency of the acetylthiol derivatives to become adsorbed on the electrodes following the redox process. [36] +0.75 [b] [a] The electrochemical gaps were obtained as the differences between the cathodic peak of the reduction process (E c red ) and the anodic peak of the oxidation process (E a ox ).…”