Silicon Tetrabromide - Comparison of SiX4

Comparison of SiX4

The properties of the tetrahalosilanes, all of which are tetrahedral, are significantly affected by nature of the halide. These trends apply also to the mixed halides. Melting points, boiling points, and bond lengths increase with the atomic mass of the halide. The opposite trend is observed for the Si-X bond energies.

SiF4 SiCl4 SiBr4 SiI4
b.p. (˚C) -90.3 56.8 155.0 290.0
m.p. (˚C) -95.0 -68.8 5.0 155.0
Si-X bond length (Å) 1.55 2.02 2.20 2.43
Si-X bond energy (kJ/mol) 582 391 310 234

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