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 electrontransfer photocatalysis.