Crystal and molecular structure of bromobis-(π-cyclopentadienyl)(tribromostannyl)molybdenum(IV)

Abstract

The crystal and molecular structure of the title compound has been determined by three-dimensional X-ray methods with intensity measurements from a linear diffractometer (orthorhombic, a= 14·05, b= 12·30, c= 8·82 Å, space group pnma or pna2₁, Z= 4), and refined by least squares to R 0·056 for 601 independent reflections. The tin atom forms four bonds directed towards the corners of a distorted tetrahedron with Sn–Mo 2·691 and mean Sn–Br, 2·505 Å. The tin co-ordination polyhedron is completed by a much longer bromine contact (3·411 Å) to give a very distorted trigonal bipyramid.

The Sn–Mo–Br bond angle is 80·2° and the Mo–Br bond length is 2·605 Å. The π-cyclopentadienyl rings are not well determined.