Lecture9PartII

Lecture9PartII - Chapter 9 Part II The Molecular Orbital...

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Chapter 9 Part II The Molecular Orbital Model
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The localized Electron Model The localized electron model (hybridization) offers important information as to the structure and bonding of molecules BUT, it is insufficient to explain : 1. Delocalization of electrons Incorrectly assumes that electrons are localized (resonance) 2. Paramagnetism Does not allow for molecules containing unpaired electrons 3. Gives no direct information about bond energies We need another model!
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Covalent Bonding Molecular Orbitals MO Theory Multicenter bonding Bonds are formed by the interaction of valence electrons with all nuclei in molecule A quantum Mechanical approach
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Molecular Orbital Theory Big Idea : Electrons are responding to all the nuclear charges in a molecule, no longer just to individual atoms The electrons are assumed to be delocalized rather than always located between a given pair of atoms. An entirely new set of Orbitals is needed Molecular Orbitals We can approximate these by taking linear combinations of atomic orbitals
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Molecular Orbital Theory Molecular Orbitals We can approximate these by taking linear combinations of atomic orbitals The electron density between the atoms is depleted (subtraction) ANTIBONDING MO The electron density between the atoms is enhanced (addition) BONDING MO The number of orbitals must always be conserved.
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Molecular orbitals MO 1 is lower in energy than the
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This note was uploaded on 09/20/2010 for the course CHEM 102 taught by Professor Peterpastos during the Summer '08 term at CUNY Hunter.

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Lecture9PartII - Chapter 9 Part II The Molecular Orbital...

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