Tris(2-phenylpyridine)iridium, abbreviated [Ir(ppy)<sub>3</sub>] is the organoiridium complex with the formula Ir(C<sub>6</sub>H<sub>4</sub>-C<sub>5</sub>H<sub>4</sub>N)<sub>3</sub>. The complex, a yellow-green solid, is a derivative of Ir<sup>3+</sup> bound to three monoanionic 2-pyridinylphenyl ligands. It is electroluminescent, emitting green light. The complex is observed with the facial stereochemistry, which is chiral.
The complex is prepared by cyclometalation reactions of 2-phenylpyridine and iridium trichloride, as represented by this idealized equation:
The complex and many analogues have been investigated for application in photoredox catalysis. Its excited state has an oxidative potential of âÂÂ2.14 V, nearly 1 V more negative than the oxidative potential of excited [Ru(bipy)<sub>3</sub>]<sup>2+</sup>.