Members of the series IrX(CO)(PPh3)2 with various anionic ligands and their dioxygen complexes
Abstract
Acetonitrile is displaced from [Ir(CO)(CH3CN)(PPh3)2]+ by the co-ordinating anions, F–, OH–, NCO–, NCS–, O2CH–, O2CCF3–, SH–, CCPh–,P-toluenesulphinate, and CN– to yield four-co-ordinate analogues of IrCl(CO)-(PPh3)2 except for the cyanide which is five-co-ordinate, IrCN (CO)(PPh3)3. The comparative uptake of dioxygen by these compounds to form dioxygen complexes has been studied. The sulphinate, Ir(P-toluenesulphinate)-(CO)(PPh3)2is O-bound but upon further co-ordination of CO or O2 the sulphinate changes to S-bound although addition of methyl iodide produces an O-bound iridum(III) compound.