CH 101 notes 9-28

CH 101 notes 9-28 - Molecular Orbital Theory (MO) Shorthand...

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Molecular Orbital Theory (MO) Section 6.5 Shorthand for MO Diagrams in Complex Systems 1. Each atom in conjugated system has an ‘s’ orbital. 2. The conjugated system will have as many MO’s as atomic orbitals. 3. The lowest energy orbital has no nodes. 4. Continue increasing the number of nodes by one. The nodes are spaced equally. 5. An MO with mostly bonding interactions is bonding. 6. An MO with mostly antibonding interactions is antibonding. 7. An MO with balanced bonding and antibonding is non-bonding. Also an MO with node on an atom. Shorthand for MO Diagrams in Complex Systems O b O a O a O b Section 6.5 S S O S O Bonding Non-bonding Anti-bonding 3 atoms = 3 MO’s π Molecular orbitals C 2 H 4 CC H H H H Each C has 1 pure p orbital: Total: 2 2 p orbitals & 2 π e - C 4 H 6 H H C H C H H H Each C has 1 pure p orbital: Total: 4 2 p orbitals & 4 π e - C 6 H 8 H H C H C C H HC H H H Each C has 1 pure p orbital: Total: 6 2 p orbitals & 6 π e - Section 6.5 E π Bonding in C 2 H 4 AO AO 2 p 2 p Antibonding MO π orbital One node between p orbitals π orbital Bonding MO No nodes between
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This note was uploaded on 06/08/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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CH 101 notes 9-28 - Molecular Orbital Theory (MO) Shorthand...

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