Rational Design of Mono- and Bi-Nuclear Cyclometalated Ir(III) Complexes Containing Di-Pyridylamine Motifs: Synthesis, Structure, and Luminescent Properties
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Heteroleptic cyclometalated iridium (III) complexes (-) containing di-pyridylamine motifs were prepared in a stepwise fashion. The presence of the di-pyridylamine ligands tunes their electronic and optical properties, generating blue phosphorescent emitters at room temperature. Herein we describe the synthesis of the mononuclear iridium complexes [Ir(ppy)(DPA)][OTf] (), (ppy = phenylpyridine; DPA = Dipyridylamine) and [Ir(ppy)(DPA-PhI)][OTf] (), (DPA-PhI = Dipyridylamino-phenyliodide). Moreover, the dinuclear iridium complex [Ir(ppy)()Ir(ppy)][OTf] () containing a rigid angular ligand " = 3,5-bis[4-(2,2'-dipyridylamino)phenylacetylenyl]toluene" and displaying two di-pyridylamino groups was also prepared. For comparison purposes, the related dinuclear rhodium complex [Rh (ppy)()Rh(ppy)][OTf] () was also synthesized. The x-ray molecular structure of complex was reported and confirmed the formation of the target molecule. The rhodium complex was found to be emissive only at low temperature; in contrast, all iridium complexes - were found to be phosphorescent in solution at 77 K and room temperature, displaying blue emissions in the range of 478-481 nm.