Abstract
The crystal structures of trans-tetrabromobis(pyridine)silicon (1) and trans-tetrabromobis(3,5-dimethylpyridine)silicon (2) have been determined: (1) crystallizes in the monoclinic space group C2/m with cell dimensions a = 14.4250(2) A, b = 7.3055(1) A, c = 7.2839(1) A,β = 117.660(1)°, (2) crystallizes in the monoclinic space group C2/m with cell dimensions a = 16.013(3) A, b = 7.316(1) A, c = 8.179(2) A, β = 113.19(1)°. Both molecules, with D2h symmetry, have crystallographic C2h site symmetry. The environment about the Si atoms can be described as a slightly distorted octahedron with the pyridyl ligands occupying axial positions and the four bromo ligands in the equatorial plane.
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