Crystal structure of carbonylchloro(tetracyanoethylene)bis(triphenylarsine)iridium

Abstract

The crystal structure of the title complex has been determined from diffractometer data by the heavy-atom method and refined by least-squares techniques to R 7·8 for 4837 independent reflections. The crystals are monoclinic, space-group P2₁/n, with a= 11·644(4), b= 18·847(5), c= 17·748(5)Å, β= 96·37(2)°, Z= 4. The co-ordination geometry is trigonal bipyramidal, with carbonyl and chlorine at the apices. The central C–C bond of the tetracyanoethylene ligand is almost parallel to the equatorial plane, and this group is greatly distorted from planarity. The Ir–C bonds and the central C–C bond are probably very slightly shorter than in the analogous bromo-(triphenylphosphine)-complex.