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Highly Quantum Efficient Phosphorescent Sky Blue Emitters Based on Diastereomeric Iridium(III) Complexes of Atropisomeric 5‑Aryl‑4H‑1,2,4-triazole Ligands

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posted on 17.12.2015 by Jerald Feldman, Giang D. Vo, Charles D. McLaren, Troy C. Gehret, Kyung-Ho Park, Jeffrey S. Meth, Will J. Marshall, Joseph Buriak, Lois M. Bryman, Kerwin D. Dobbs, Thomas H. Scholz, Steve G. Zane
Homoleptic fac-IrIIIL3 complexes of 5-aryl-4H-1,2,4-triazole ligands are sky blue emitters. When unsymmetrically substituted, the triazole ligands exhibit atropisomerism, and upon cyclometalation to Ir­(III) a mixture of diastereomers is formed. We have isolated and structurally characterized all four possible diastereomers of the fac-IrIIIL3 complex formed upon cyclometalation of an atropisomeric 5-aryl-4H-1,2,4-triazole ligand onto Ir­(III). The phosphorescent blue emitting materials reported herein are among the most efficient to date, with quantum efficiencies above 95%.