Molecular Theory 8

1
Fred J. Grieman
Molecular Theory (8) Localized bonding via hybrid
orbitals Examples on board Molecular Orbital
Theory Delocalized p MOs Combine Localized
for s Delocalized for p
2
Localized Bonding via Hybridization

• 1. Draw
• 2. Determine hybridization of central atoms
• SN 2 3 4 5 6
• 3. Combine
• 4. Use
• 5. Use

3
Polyatomic molecules and Delocalized Bonding
not so well for
delocalized bonding (resonance structures)
Our method combine for ? bonding,
for ? bonding NO3- as an example
N hybridization? O hybridization?
p-bonding delocalized
4
Conjugation alternating double bonds 1,3
butadiene
4 carbons
2 double bonds in the 1 3 postions
p bond
4 p orbitals Notice
5
Benzene
Resonance Structures delocalized p bonding
6
6 delocalized ? molecular orbitals from 6 p
atomic orbitals
6 electrons in ? orbitals