oct 15 - Fri 15 Oct 10 Announcements Lecture 7 Molecular...

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1 Fri, 15 Oct 10 • Announcements • Lecture 7 – Molecular orbital model (14.2) • In section 14.1, we learned about atomic orbital hybridization : a method of combining AOs to describe the experimentally-observed structure of molecules. • It is very useful for describing 3D shapes of molecules, but since the bonds are modeled as the overlap of localized atomic orbitals, it has its limitations: – There are many stable systems with an even number of electrons that have unpaired electrons (O 2 is an example) …hybrid orbitals are unable to describe the bonding such systems. – We cannot obtain direct information about bond energies using hybrid orbitals, nor can we describe absorption/emission spectra of molecules using the hybrid orbital scheme. – Orbital hybridization is unable to describe certain resonance systems… • We need a more sophisticated model of bonding…
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2 Molecular Orbital Theory • In MO theory, like in the AO hybridization scheme, we take combinations of AOs to construct new orbitals…
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oct 15 - Fri 15 Oct 10 Announcements Lecture 7 Molecular...

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