摘要:
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) Angstrom, b = 7.3055(1) Angstrom, c = 7.2539(1) Angstrom, beta = 117.660(1)degrees, (2) crystallizes in the monoclinic space group C2/m with cell dimensions a = 16.013(3) Angstrom, b = 7.316(1) Angstrom, c = 8.179(2) Angstrom; beta = 113.19(1)degrees. Both molecules, with D-2h symmetry, have crystallographic C-2h 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.