Crystal and molecular structure of µ-(dichlorostannio)-bis(tricarbonyl-π-cyclopentadienylchromium)

Abstract

The crystal structure of the title compound has been determined by three-dimensional X-ray diffraction methods by use of counter data and refined to R 0·057 for 3458 unique reflections by least-squares methods. The mono-clinic unit cell, space group P21/n, has dimensions a= 10·314 ± 0·012,b= 15·646 ± 0·020, c= 12·223 ± 0·012 A,β= 93·25 ± 0·1°, for Z= 4. The molecular structure consists of SnCl2 inserted into the metal–metal bond of the parent dimer [{(π-C5H5)Cr(CO)3}2]. The environment about the tin atom is distorted tetrahedral [Cr–Sn–Cr 130·2(1), Cl–Sn–Cl 95·0(1)°; mean Sn–Cr 2·697(3), Sn–Cl 2·417(4)A]. The chromium atoms have distorted octahedral environments with the carbonyl groups lying along {100} directions and the cyclopentadienyl rings lying parallel to the () faces. The Cr–Sn bonds are directed along the normals to the (11) faces of the octahedra.