W2013CHM2311 Part 4a Notes

U 2p g 2p g 2p u 2p u 2p g 2p g 2p u

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Unformatted text preview: heory: Homonuclear Second Period Diatomics Li2 [σg2 (2s)] σu * 2s 2s Energy σg This is in agreement with gas ­phase observa0ons σu * 1s 1s σg Bond Order = MO Theory: Homonuclear Second Period Diatomics Be2 [σg2 σu*2 (2s)] σu * 2s 2s Energy σg σu * 1s 1s σg Bond Order = p ­Orbital Interac0ons energy ψ*MO= caϕ2pzA  ­ cbϕ2pzB σ*u π*g π*g ψ*MO= caϕ2pyA  ­ cbϕ2pyB px py σ* ­orbitals are higher in energy than π* ­orbitals ψ*MO= caϕ2pxA  ­ cbϕ2pxB px pz πu πu ψMO= caϕ2pyA + cbϕ2pyB ψMO= caϕ2pxA + cbϕ2pxB σg ψMO= caϕ2pzA + cbϕ2pzB py pz MO Diagrams for Second Period Diatomics energy σu * B2 [πu1 πu1 (2p) ] πg* πg* 2p σg 2p Why is σg higher in energy than πu?? πu πu 2s σu * σg 2s MO Energy Levels for Homonuclear Diatomics (from Co_on and Wilkinson) Notes: 1. All energy levels drop from leS to right, why? 2. Do highest occupied levels really rise from leS to right? 3. Are there magic numbers associated with diatomics (high bond...
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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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