Deep red photocatalysis via direct S0 → T1 excitation of an Ir(iii) complex using 740 nm light

Abstract

We report the first examples of deep-red Ir(III) photochemistry using [Ir(ppy)₂(p-biphe)]PF₆ (ppy = 2-phenylpyridine; p-biphe = 6,6′,7,7′-biphenanthridine). Red light (740 nm) directly excites into the triplet manifold, populating a long-lived excited state (54 ± 3 ns) with mixed triplet metal-to-ligand charge-transfer/ligand-centered character capable of energy-transfer and electron-transfer photocatalysis.