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Chemical Shift

Last updated

Feb 28, 2022
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- Chemical Ionization
- Chemically Equivalent Ligands

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The chemical shift (symbol: δ; units: ppm) of a nucleus (eg: ¹H, ¹³C) in a molecule is a measure of how shielded (see shielded nucleus) or how deshielded (see deshielded nucleus) the nucleus is when the molecule is in an external magnetic field. The higher the chemical shift of a shielded nucleus, the less shielded the nucleus. The higher the chemical shift of a deshielded nucleus, the more deshielded the nucleus. Or, if two nuclei in the same molecule have different chemical shifts, the nucleus with the higher chemical shift is deshielded; the one with the lower chemical shift is shielded.

eg: methyl acetate (1)

The shift of H_b is higher than that of H_a, meaning H_b is less shielded than H_a, or H_b is deshielded and H_a shielded.

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