Boron Bonds to ItselfThere are many compounds in which the element does just that, it bonds to itself. Consider a few of its combinations with hydrogen (see the image). As you advance to larger boron-hydrogen structures, however, it becomes clear the molecular bonding for boron differs considerably from the hydrocarbons.
DodecaboraneDodecaborane somewhat resembles dodecahedrane (C20H20) in outward appearance, even though in terms of bonding, there is considerable difference. Also, the names mislead somewhat. In dodecahedrane, there are 20 carbon atoms, whereas in dodecaborane, there are only 12 atoms of boron.
The reason is the dodeca- part refers to the number 12. There are 12 boron atoms in dodecaborane. There are 12 surface pentagons in dodecahedrane.
Dodecaborate DianionInterestingly, both borane and diborane are unstable molecules. One would suspect that, if the precursors of larger boranes were unstable, so would be their larger analogues – if they could be synthesized at all.
Despite that, theory suggested the existence of a stable icosahedral dianion of dodecaborane as early as 1955. Theory was proven by synthesis in 1960. The chemical formula of dodecaborate dianion is written,
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