Series10HybridizationPart1

Series10HybridizationPart1 - Hybridization Part 1 Reading:...

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Unformatted text preview: Hybridization Part 1 Reading: Gray: (4-1), (4-2), and (4-4) OGC: (6.2.6), (6.4) and (6.5) X-1 MO-LCAO works great for diatomic molecules! But... What about other numbers of atoms? The story so far: Will MO-LCAO work for polyatomic molecules? X-2 Let ʼ s try BeH 2 We know: • BeH 2 is a linear molecule, by VSEPR. • The electron confguration oF BeH 2 is H H Be Be: 1s 2 2s 2 H: 1s 1 1s 2s 2p 1s Bond angle: 180° X-3 H Be BeH 2s 1s 2p σ * π n σ b σ b BeH 1s σ * σ b σ b π n σ * π n σ * σ b H BeH 2 Make MO ʼ s: First bond H and Be to form BeH Next bond H and BeH to form BeH 2 The MO ʼ s for BeH 2 are complicated and hard to work with. X-4 Attempt to make a graphical model of BeH 2 : Are any of these models reasonable? ? 2s 1s 1s Be H H + Be: 1s 2 2s 2 2s 2p z + + 2s 2p z Be H H 1s 1s + + H: 1s 1 1s + H: 1s 1 1s + 2p z H H Be + 1s 1s X-5 These two are no good: One orbital can ʼ t hold four electrons ? 2s 1s 1s Be H H + Be: 1s 2 2s 2 2s 2p z + + 2s 2p z Be H H 1s 1s + + H: 1s 1 1s + H: 1s 1 1s + 2p z H H Be + 1s 1s Attempt to make a graphical model of BeH 2 : X-6 90° This one is no good: According to VSEPR, the bond angle should be 180°. ? 2s 1s 1s Be H H + Be: 1s 2 2s 2 2s 2p z + + 2s 2p z Be H H 1s 1s + + H: 1s 1 1s + H: 1s 1 1s + 2p z H H Be + 1s 1s Attempt to make a graphical model of BeH 2 : X-7 Unfortunately, none of these models make sense. ? 2s 1s 1s Be H H + Be: 1s 2 2s 2 2s 2p z + + 2s 2p z Be H H 1s 1s + + H: 1s 1 1s + H: 1s 1 1s + 2p z H H Be + 1s 1s Attempt to make a graphical model of BeH 2 : X-8 Maybe if we blended the orbitals together... hybridized the orbitals... 2 sp hybrids + 2s 2p z + 2p z + + 2s Be X-9 Hybridization in terms of electron conFguration: 2p z 2s 1s 2s 2p 2p y 2p x 1s Decouple electron pair Be Unhybridized X-10 1s 2s 2p 2sp hybrids 2p y 2p x 2p z 2s 1s...
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This note was uploaded on 10/27/2010 for the course CH 1a taught by Professor Lewis during the Fall '08 term at Caltech.

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Series10HybridizationPart1 - Hybridization Part 1 Reading:...

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