Chapter 2 handouts

Chapter 2 handouts - Chapter 2 Structure and Properties of...

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Chapter 2 Structure and Properties of Organic Molecules
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Chapter 2 2 Wave Properties of Electrons • Standing wave vibrates in fixed location. • Wave function, ψ , mathematical description of size, shape, orientation • Amplitude may be positive or negative • Node: amplitude is zero + _ + - =>
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Chapter 2 3 Wave Interactions • Linear combination of atomic orbitals ¾ between different atoms is ___________ ¾ on the same atom is _____________. • Conservation of orbitals • Waves that are in phase ___________. Amplitude __________. • Waves that are out of phase ________. => Formation of covalent bonds – molecular orbitals can be constructed from atomic orbitals
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Chapter 2 4 Waves and Bonding
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Chapter 2 5 Antibonding Interactions
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Chapter 2 6 Electrons and Bonding Antibonding MO has node between nuclei – zero electron density, nuclei repel each other. Bonding MO:
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Chapter 2 7 Sigma Bonding • ____________ lies between the _____. • A bond may be formed by s-s , p-p , s-p , or hybridized orbital overlaps. • The bonding MO is __________ than the original ____________. • The ___________ MO is higher in energy than the atomic orbitals. =>
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Chapter 2 8 H 2 : s-s overlap =>
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Chapter 2 9 Cl 2 : p-p overlap =>
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Chapter 2 10 Pi Bonding • Pi bonds are ____________ than sigma bonds. • _________ overlap of parallel p orbitals. =>
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Chapter 2 11 Short-hand drawings Organic chemists use the following representations of pi MOs, especially for conjugated polyenes. (You will have to copy these in class.)
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Chapter 2 12 Multiple Bonds • A double bond (2 pairs of shared electrons) consists of a ______ bond and a __ bond. • A triple bond (3 pairs of shared electrons) consists of a _____ bond and ____ bonds.
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Chapter 2 handouts - Chapter 2 Structure and Properties of...

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