L39%20md%20as-v2-color

L39%20md%20as-v2-color - Lecture 39 Dying Dying to Know Dye...

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Unformatted text preview: Lecture 39 Dying Dying to Know: Dye Molecules Key Idea: The colors of dye molecules can be described in terms of molecular orbitals. Molecular orbital theory, H 2 Combination of two H 1s orbitals gives two MO orbitals of H 2 . σ 1s is the bonding orbital and σ * 1s is the antibonding orbital. Each time two atomic orbitals combine, we get two MO orbitals: bonding and antibonding Compare σ and σ * Bonding ( Bonding ( σ ) • Good overlap of atomic Good overlap of atomic orbitals orbitals • Electrons on each atom Electrons on each atom are attracted to each are attracted to each other other ’s protons s protons • MO energy is lower than MO energy is lower than AOs AOs Anti Anti-Bonding ( Bonding ( σ *) *) • Poor overlap of atomic Poor overlap of atomic orbitals orbitals • Node between atoms Node between atoms • Protons in atoms repel Protons in atoms repel each other each other • MO energy is higher than MO energy is higher than AOs AOs Energy level diagram for MO’s of second-row...
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This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at Berkeley.

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L39%20md%20as-v2-color - Lecture 39 Dying Dying to Know Dye...

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