Carbon 13 NMR
This is part of the HSC Chemistry course under the topic Analysis of Organic Substances.
HSC Chemistry Syllabus
Investigate the processes used to analyse the structure of simple organic compounds addressed in the course, including but not limited to:
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proton and carbon-13 NMR
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mass spectrometry
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infrared spectroscopy (ACSCH130)
Carbon-13 NMR
What is carbon-13 NMR? What information does carbon-13 NMR provide on an organic molecule? This video explains how carbon-13 NMR spectroscopy can be used to analyse organic molecules and outlines the key information that a carbon-13 NMR spectrum can provide.
Carbon-13 NMR
- Analyses carbon-13 nuclei instead of the far more abundant carbon-12 nuclei because the latter do not possess a net magnetic spin and thus, cannot be analysed using NMR.
- Carbon-13 nuclei in different chemical environments require different radiofrequency EMR to transition to a higher energy state. This frequency is compared to the frequency absorbed by a reference molecule (e.g. TMS), and used to calculate the chemical shift according to the formula:
$$\delta = \frac{V_{sample} - V_{ref}}{V_{ref}}$$
- The number of carbon-13 nuclei in different chemical environments are represented by the total number of signals in the NMR spectrum.
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