11-23-11 - Chemistry 1A F11 11.23.11 Dr. Shaka MO Picture R...

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298 Chemistry 1A F11 11.23.11 Dr. Shaka Course Code 40000 MO Picture Rather than bond atoms together two at a time, in the MO picture we set up all the positive nuclei with their core electrons, and then make new orbitals over the whole nuclear framework. Electrons can be delocalized over several atoms, in extended molecular orbitals . We don’t need resonance structures or other crutches with MO theory. It’s better.
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299 Chemistry 1A F11 11.23.11 Dr. Shaka Course Code 40000 MO Picture We make our MOs by “adding up” the atomic orbitals we have available. Orbitals are waves; they have a phase, and ϕ A + ϕ B is distinct from ϕ A ϕ B . To come together to form MOs, the AOs must Overlap in space. Have the same symmetry. Have similar energy. We end up with the same # of MOs as the # of AOs we start out with.
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Chemistry 1A F11 11.23.11 Dr. Shaka Course Code 40000 MO Picture for H 2 , H 2 + , H 2 We have two H 1 s AOs. We end up with two MOs with σ symmetry. If we
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This note was uploaded on 12/12/2011 for the course CHEM 1A taught by Professor Tobias during the Fall '01 term at UC Irvine.

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11-23-11 - Chemistry 1A F11 11.23.11 Dr. Shaka MO Picture R...

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