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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 . 1s is the bonding orbital and * 1s is the antibonding orbital. Each time two atomic orbitals combine, we get two MO orbitals: bonding and antibonding Compare and * Bonding ( Bonding ( ) 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 ( *) *) 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 MOs of second-row...
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