Carbon NMR vs Proton NMR: Key Differences & When to Use Each
Carbon NMR (¹³C NMR) detects carbon atoms; Proton NMR (¹H NMR) detects hydrogen atoms. Both use magnetic fields, but the “camera” points at different elements.
Students swap them because spectra look similar—peaks, ppm, integration—yet reveal totally different molecular maps. Mix them up and you’re reading the wrong blueprint.
Key Differences
¹H NMR: high sensitivity, 0-12 ppm range, shows splitting patterns. ¹³C NMR: low sensitivity, 0-220 ppm, usually decoupled, no splitting. One counts hydrogens, the other counts carbons.
Which One Should You Choose?
Use ¹H NMR for quick functional-group checks or proton counts. Reach for ¹³C NMR when you need carbon skeleton details or when ¹H peaks overlap.
Why does ¹³C NMR need more sample?
Only 1% of carbon is ¹³C, so the signal is naturally weaker.
Can I run both on the same sample?
Yes. Most NMR tubes fit both experiments, saving time and material.