Coordination complexes containing multidentate ligands : V. The reactions between trans-carbonylchlorobis(triphenylphosphine)iridium and trans-carbonylchloro(triphenylarsine)iridium and some tridentate group VB ligands

Bis3-(dimethylarsino)propyl]phenylarsine, (tas), reacts with trans-Ir(CO)(EPh₃)₂ X (E = P, As; X = F, Cl, Br, I) to yield the (Ir(CO)(tas)] X complexes. In contrast, the similar ligand bis3-(dimethylarsino)propyl]phenylphosphine, (dap), reacts with trans-Ir(CO)(EPh₃)₂X (E = P, As; X = Cl, Br, I) to yield a mixture of Ir(CO)(dap)X] and Ir(CO)(dap)]X, and with trans Ir(CO)(EPh₃)₂F (E = P, As) to yield solely Ir(CO)(dap)F]. The cations Ir(CO)(L)]⁺ (L = tas, dap) readily yield tetraphenylborate derivatives, Ir(CO)(L)]BPh₄. The oxygenation of Ir(CO)(tas)]⁺ in solution proceeds almost to completion after 15 h, whereas Ir(CO)(dap)]⁺ does not appear to undergo oxygenation.