Structure of a stable iron(0) mono-olefin chelate complex with 2-vinylphenyldiphenylphosphine: dicarbonylbis[(2-vinylphenyl)diphenylphosphine]iron(0)

Abstract

The crystal and molecular structure of the title compound, a mono-olefin analogue of Fe(CO)₅, has been determined from three-dimensional X-ray diffractometer data. Atom parameters have been refined in the non-standard centred space group B2₁/c[monoclinic, a= 15·771(6), b= 18·468(6), c= 24·499(8)Å, β= 97·76(3)°, Z= 8]. Block-diagonal least-squares refinement has converged at R 0·050 for 2776 unique reflections. The ligand arrangement is approximately trigonal bipyramidal about the central iron atom, with phosphorus atoms in the axial sites; the equatorial sites are occupied by one π-bonded vinyl and two carbonyl groups. Fe–P in the chelated sp ligand [2·205(2)Å] is significantly shorter than that in the unidentate ligand [2·239(2)Å]. The π-bonded vinyl group is symmetrically co-ordinated, with Fe–C 2·092(5) and 2·108(5)Å.