How many peaks in the C-NMR spectrum? ### 13.3 How Many Peaks in the ¹³C-NMR Spectrum?#### Transcription:The image presents a chemical structure with a nitrogen atom (N) at the center, bonded to three carbon groups. This structure is of a tertiary amine, specifically trimethylamine, where the nitrogen is bonded to three methyl groups (CH₃).#### Explanation:In ¹³C-NMR (Carbon-13 Nuclear Magnetic Resonance) spectroscopy, the number of peaks corresponds to the number of unique carbon environments in a molecule. For the given structure:- **Symmetry Consideration:** All three methyl groups (CH₃) are equivalent due to the symmetrical arrangement around the nitrogen atom.- **Unique Carbon Environments:** There is only one unique carbon environment present.Therefore, the ¹³C-NMR spectrum of trimethylamine would show a single peak, corresponding to the equivalent methyl groups.This fundamental understanding of symmetry and equivalence in molecules aids in interpreting NMR spectra for structural analysis and chemical identification.

Answered: How many peaks in the C-NMR spectrum?

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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How many peaks in the C-NMR spectrum?

### 13.3 How Many Peaks in the ¹³C-NMR Spectrum?

#### Transcription:

The image presents a chemical structure with a nitrogen atom (N) at the center, bonded to three carbon groups. This structure is of a tertiary amine, specifically trimethylamine, where the nitrogen is bonded to three methyl groups (CH₃).

#### Explanation:

In ¹³C-NMR (Carbon-13 Nuclear Magnetic Resonance) spectroscopy, the number of peaks corresponds to the number of unique carbon environments in a molecule.

For the given structure:

- **Symmetry Consideration:** All three methyl groups (CH₃) are equivalent due to the symmetrical arrangement around the nitrogen atom.
- **Unique Carbon Environments:** There is only one unique carbon environment present.

Therefore, the ¹³C-NMR spectrum of trimethylamine would show a single peak, corresponding to the equivalent methyl groups.

This fundamental understanding of symmetry and equivalence in molecules aids in interpreting NMR spectra for structural analysis and chemical identification.

Expert Solution

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Carbon-13 (C-13) nuclear magnetic resonance (most commonly known as carbon-13 NMR spectroscopy or ¹³C NMR spectroscopy or sometimes simply referred to as carbon NMR) is the application of nuclear magnetic resonance to carbon.

It is analogous to proton NMR (1H- NMR) and allows the identification of carbon atoms in an organic molecules just as proton NMR identifies hydrogen atoms. ¹³C NMR detects only the ¹³ C isotopes. The main carbon isotope, ¹² C is not detected.

Although much less sensitive than ¹H NMR spectroscopy, ¹³C NMR spectroscopy is widely used for characterising organic and organometallic compounds.

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