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
Famous quotes containing the words comparison of and/or comparison:
“When we reflect on our past sentiments and affections, our thought is a faithful mirror, and copies its objects truly; but the colours which it employs are faint and dull, in comparison of those in which our original perceptions were clothed.”
—David Hume (1711–1776)
“He was a superior man. He did not value his bodily life in comparison with ideal things. He did not recognize unjust human laws, but resisted them as he was bid. For once we are lifted out of the trivialness and dust of politics into the region of truth and manhood.”
—Henry David Thoreau (1817–1862)