W2013CHM2311 Part 4a Notes

Ie reec0on along the internuclear axis results in a

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Unformatted text preview: interference to form two MOs: ConstrucBve Interference ϕ2pzA ϕ2pzB DestrucBve Interference ϕ2pzA ϕ2pzB ψMO= caϕ2pzA + cbϕ2pzB ψ*MO = caϕ2pzA  ­ cbϕ2pzB Overlap of regions of the same sign leads to increased concentra0on of electrons between nuclei. Overlap of regions of opposite sign leads to decreased concentra0on of electrons between nuclei. Nodes in the Molecular Orbitals Molecular Orbitals Out ­of ­phase interac0on results in a higher energy an0bonding σ* orbital. ϕ2pzA  ­ ϕ2pzB Atomic Orbitals Three Nodes (+) ( ­) (+) ( ­) ψ*MO = caϕ2pzA  ­ cbϕ2pzB Note: The sign of the wave func0on changes every 0me it passes through a node. This is indicated by a change in the shading of the lobe. ϕ2pzA ϕ2pzB Two Nodes In ­phase interac0on results in a low energy bonding σ orbital. (+) ϕ2pzA + ϕ2pzB ( ­) (+) ψMO= caϕ2pzA + cbϕ2pzB Pairwise Combina0ons of 2s and 2p σ ­bonds AnBbonding σ ­orbitals σ *(p – p) σ*(s – s) – – + + –  ­+ Nodes Bonding σ ­orbitals σ(p + p) σ(s + s) +  ­ +  ­ Deriving the Appearance of Molecular Orbitals from px ­Orbital Overlap ConstrucBve Interference ϕ2pxA...
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This note was uploaded on 03/28/2014 for the course CHM 2311 taught by Professor Richardson during the Winter '09 term at University of Ottawa.

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