Fluoroacyl complexes of iridium have been prepared by reaction of XeF2 with the iridium carbonyl complexes [lr(CO)3L2]+ (L = PMe3, PMe2Ph, PEt2Ph or PEtPh2), [Ir(CO)2Cl(PMe3)2] and [Ir(CO)(PMe3)4]+. The reaction can be viewed as an unusual type of oxidative addition and this is supported by the need for strongly electron-donating phosphines for reaction to occur. The complex [Ir(CO)2F(COF)(PEt3)2]+ reacts with SiH3X (X = CN, NCS or NCO) to give acyl complexes [Ir(CO)2F(COX) (PEt3)2] + and with BF3 to give [Ir(CO)3(PEt3)2]2+. This dication reacts further with PMe3 to give an acyl product with PMe3 bound to a carbonyl ligand. The complex [Ir(CO)3(PPh3)2]+ reacts with XeF2 + BF3 to give [Ir(CO)3F(PPh3)2]2+. Products were characterised using F-19, P-31 and C-13 NMR spectroscopy.
|Number of pages||7|
|Publication status||Published - 7 Apr 1993|
- LIGAND EFFECTS QALE