Metal–metal bonding in co-ordination complexes. Part VII. Crystal structure of dicarbonylcyclopentadienyl(tribromostannyl)iron

Abstract

The crystal structure of dicarbonyl-π-cyclopentadienyl(tribromostannyl)iron has been determined by single-crystal X-ray methods using the intensities of 1478 spectra measured by counter diffractometry. The crystals are orthorhombic, space group Pbca, a= 12·584(1), b= 13·427(1), c= 15·159(2)Å, Z= 8. The structure was solved by symbolic addition methods and refined by block-diagonal least-squares techniques with individual anisotropic thermal parameters to R= 0·04.

The molecule contains a short Sn–Fe σ-bond, 2·462(2)Å. Fe–Sn–Br and Br–Sn–Br angles lie in the ranges 117·6–118·4 and 98·6–101·6° respectively. Average bond distances are: Sn–Br, 2·501(2); Fe–C(ring), 2·088(2); Fe–C(carbonyl), 1·76(1); C–O, 1·13(1); C–C, 1·394(5)Å.

Molecular interactions are of normal van der Waals type with no abnormally short inter- or intra-molecular contacts.