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The molecular orbital diagram here in the allotropes section([]) is quite different from the one for the same molecule given here([]. The bonding 2p pi orbitals are lower in energy compared to the bonding 2p sigma orbital as per the latter while the one in this article shows the opposite picture. As my understanding of molecular orbital theory is quite limited, i am not sure which one is correct. Although what i have learnt till now tells me that the latter is correct, i think it would be best to let someone with a better understanding of the theory to have a look and suggest an edit... — Preceding unsigned comment added by 184.108.40.206 (talk) 04:45, 20 March 2018 (UTC)
The scale is somewhat exaggerated: the energies of the 2sσ, 2pσ, and 2pπ orbitals are actually very close. I redrew the MO diagram here from Clayden, Greeves, and Warren (p. 94), but they left out this detail for simplification (since it wasn't their focus, although in that case I would've thought it sounder to use O2 as the example instead). The bonding 2pσ orbital should indeed be higher in energy than the bonding 2pπ orbitals because the 2s and 2p orbitals are still similar enough in energy at N2 to have a significant bonding interaction, decreasing the energy of the 2sσ orbital and increasing that of the 2pσ orbital (see ChemWiki for a more complete explanation). I have replaced the diagram and tagged the old one for deletion, as it is wrong. Thank you for alerting me to this! Double sharp (talk) 07:21, 20 March 2018 (UTC)