Why sp2 hyb. have more energy density compared with sp3?

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SUMMARY

sp2 hybridized orbitals exhibit higher energy density compared to sp3 hybridized orbitals due to their increased s character, which results in stronger bonds and closer atomic proximity. In nuclear magnetic resonance (NMR) calculations, the electron density near the nucleus is crucial, as only s-orbitals contribute to shielding effects. While sp2 hybridized compounds, such as alkenes, are generally less shielded than sp3 hybridized compounds like alkanes, this phenomenon is attributed to the circulation of pi electrons in the magnetic field rather than a direct correlation with electron density.

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MrGenetic
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why sp2 hyb. have more e. density comp with sp3 in nmr calculation stuff ?
 
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Because in a sp2 hyb., the bond is stronger, so atoms are closer then in sp3 single bond.
 
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MrGenetic said:
why sp2 hyb. have more e. density comp with sp3 in nmr calculation stuff ?
Do you really mean energy density or rather electron density?

sp2 hybrids have more s character than sp3 hybrids. The chemical shifts depend on the electron density near the nucleus, but only s-orbitals have electron density at the nucleus, hence they are most effective in shielding.
 
This is kind of a weird question, given that alkenes are generally less shielded than alkanes, for both 1H and 13C NMR spectra. However, this is due to the circulation of the pi electrons induced by the applied magnetic field, not any effect having to do directly with electron density.
 
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