A summary of topic 19, organised so the notes are easy to understand. The notes are on slides, so they can be printed out and used as revision cards or posters, for revision on the go. The notes cross-reference the specification so it is easy to see where each bit of information has come from. They...
High resolution proton NMR (H’s) 13C NMR
1. Environments CH3CH2COOCH3 = positions of 13C in a molecule
No. of peaks = no. of H environments Same steps as high resolution proton NMR (H’s)
3 environments
∴ 3 peaks
2. Relative intensity of peaks
No. of H’s in each environment = intensity
1 = 3xH ∴ 3 : 2 : 3
2 = 2xH
3 = 3xH
3. Chemical shift
How much the field shifted from the field for TMS
⤷ TMS calibrates spectrum (peak at 0)
⤷ Used because it’s non-toxic, inert, low BPT (easy to
remove), 1 peak (1 environment) ect.
⤷ Chemical shifts are in data booklet
R-CH3 → 0.7-1.6
-O-CH3 → 3.3-4.3
R-CH2-C=O →3.0-2.9
4. Splitting
No. of peaks = no. of adjacent H’s +1
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