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 |
Read more about this topic: Silicon Tetrabromide
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