Why don't we integrate 13C NMR? Why don't we collect multiplicity information?
Автор: Chem240_DJS
Загружено: 2025-10-06
Просмотров: 87
Описание:
In 1H NMR spectra, we set a reference, pick peaks, integrate, and notice the multiplicity of peaks. For any multiplets, we then measure J's. By contrast, 13C NMR is... singlets only? Kind of? Why don't we integrate?
The short answer is "integration doesn't work well" and "you get better signal to noise" if you collapse the peaks into singlets.
More Details on Integration doesn't work well:
• S'21 - NMR 8 - 13C Intensity, not integration
More details on splitting in 13C NMR
Intro-y video: • S'21 - NMR 6 - 13C Multiplicity - tricky t...
WAY more complicated: • S'21 - NMR 7 - Complicated 13C splitting
Timestamps:
0:00 - Proton NMR information
1:10 - 13C has less information - DELIBERATELY
1:34 - Predicting ethyl acetate
2:06 - 13C NMR decoupled - what you are USED to
2:47 - Predicting integrations in ChemDraw - they WORK!
3:34 - Integration DOES NOT WORK in 13C NMR
5:00 - H's bound help some carbons relax faster
5:42 - predicting 13C multiplicity
6:38 - 13C coupled to 1H spectrum
6:51 - focusing on intensity of singlet vs multiplet
8:36 - Both spectra on a common axis
9:58 - Summing up
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