Boron: Group 3A

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Boron Group 3A
Boron Hydrides BxHy
Also called boranes
Simplest is diborane B2H6 Draw its Lewis
structure
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Bonding in diborane
Reactions of diborane
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Other boron hydrides
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Metalloboranes and carboranes
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Boron vs. Aluminum Halides
Boron trichloride
Aluminum trichloride
Predict the structure of BeCl2.
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Some Cool Hydroxides
LiOH Mg(OH)2 B(OH)3 Al(OH)3
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Boron Oxides
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Boron Nitride
What is the Lewis structure similar to?
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Industrial Production of Diamonds
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H2(g) ? 2 H(g) H(g) CH4(g) ? CH3(g)
H2(g) CH3 C(diamond-H, surface) ? Diamond-CH3
H
Why is diamond formed, and not graphite? Reason
1. Reverse Reaction favors Graphite Instability H
diamond ? CH4, but slower than CVD diamond
growth H graphite ? CH4, but faster than CVD
graphite growth Reason 2. Forward Reaction
favors Diamond Formation sp3 C atoms on surface
(show structures) slow sp2 graphite formation.
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