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Topic: molecular orbital energies of C2 vs O2?  (Read 1989 times)

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Offline iScience

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molecular orbital energies of C2 vs O2?
« on: June 12, 2015, 08:11:10 AM »
why is the σ2p orbital energy lower than the π2p for O2, F2, and Ne2. why is it the opposite for  B2, C2, and N2?

what factors affect the bond energy of particular orbitals?
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Offline Corribus

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Re: molecular orbital energies of C2 vs O2?
« Reply #1 on: June 12, 2015, 08:45:20 PM »
It has to do with the relative energies of the 2p and 2s atomic orbitals - owing to core charge differences - and the resulting extent of mixing that is related to their energy separation.

See section 2.4 here: https://en.wikibooks.org/wiki/Introduction_to_Inorganic_Chemistry/Molecular_Orbital_Theory
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What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman
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