Photochemical reactivity of 2[IrIIIHCl2(PPri3)2]·H2. Formation of monohydrido isomers of IrIII and evidence of photoinduced oxidative addition of H2, to IrIII

Abstract

Photolysis in CH₂Cl₂ of the system 2[Ir^IIIHCl₂(PPrⁱ₃)₂]·H₂(A), using light at 404 nm occurs with a quantum yield of 0.75 to give three new geometrical isomers of (A). N.m.r. spectroscopy and the chemical reactivity of the photoreaction mixtures have revealed the presence of equilibrium amounts of species containing molecular hydrogen. When (A) is irradiated in the presence of H₂ the complex [Ir^VH₃Cl₂(PPrⁱ₃)₂] is formed by an oxidative-addition reaction.