硼化学[Boron Chemistry] - 达人(其实～我是卧底，来自外星)

2004/12/24 | 硼化学[Boron Chemistry]
类别(℃〖化学〗) | 评论(0) | 阅读(81) | 发表于 18:01: Boron naturally occurs in borax . It is isolated by reduction with magnesium

Boron hydrides are the best fuels known. They are pyrophoric, however, and ignite upon contact with the atmosphere. In addition to being toxic, boron hydrides also yield high-mass B(OH)₃ (s) as exhaust which does not provide good thrust. The molecule B₁₂ is icosahedral. Boric acid decomposes as

Boron Hydride (BH₃) exists only as a reaction intermediate

It is a Lewis acid which forms BH , BH₄CO, BH₄NH₃.
Diborane (B₂H₆) is a bridge-bonded compound:

It decomposes at 200 as

which are all 11-electron compounds. Additional reactions are

(-2229 kJ mol^-1) and

(-1557 kJ mol^-1).
The compound B₅H₉ has Csymmetry. The number of bonding electrons are

which are allocated to bonds as

The compound B₄H₁₀ is icosahedral (with 12 vertices and 20 faces), and undergoes hybridization. B₃N₃H₆ is cycloborane with N's and B's occupying alternate sites in the ring.; 0