Crystal structure of dicarbonyl(thiocarbonyl)bis(triphenylphosphine)iridium(<scp>I</scp>) hexafluorophosphate–acetone

Crystals of the title compound are monoclinic with a= 15&#183;199, b= 23&#183;814, c= 13&#183;383 A, β= 119&#183;07&#176;, Z= 4 space group P21/m. 7113 visually estimated intensities were used, and the structure refined to R 9&#183;83%. There are two crystallographically independent cations each possessing a mirror plane. The iridium atoms are at the centre of a trigonal bipyramid with the PPh3 ligands at the apices and the CO and CS groups co-planar with the iridium atoms in the equatorial plane. Mean thiocarbonyl bonding parameters are: Ir–C(S) 1&#183;867, C–S 1&#183;511 A; Ir–C–S = 178&#183;2&#176;. The σ and π bonding properties of the CO and CS groups are compared.