A short presentation (including examples) of Carbon-13 NMR Spectroscopy. Suitable for most specifications, but specifically tailored for the OCR exam board for the F324 paper. The PowerPoint is based on the analysis (1.3) section of the course.

1. 13C NMR SPECTROSCOPY
OCR Chemistry F324 - 1.3 - Analysis

2. INTRODUCTION TO CARBON-13 SPECTROSCOPY
➤ Carbon-13 nuclei are ‘spin½’ nuclei, and can hence behave as a magnet.
➤ It can therefore be opposed / aligned to an external magnetic field.
➤ It is possible to oppose the direction by applying a specific amount of
energy.
➤ Radio waves are used to supply the energy.
➤ This ‘flipping’ process is known as resonance condition.

3. EXAMPLE 1
➤ Ethanol:
➤ 2 peaks due to 2 different chemical
environments

4. EXAMPLE 1
➤ Ethanol:
➤ 2 peaks due to 2 different chemical
environments.
➤ The first carbon environment (the C
on CH3) has the bond
➤ The peak around 20 shows a C-C is
present.
➤ The peak around 60 shows a C-O is
present.
➤ They are equal heights showing that
there are an equal number of carbon
environments.

5. EXAMPLE 2
➤ 1-methylethylpropanoate
➤ 2 peaks due to 2 different chemical
environments.
➤ The first carbon environment (the C
on CH3) has the bond
➤ The peak around 20 shows a C-C is
present.
➤ The peak around 60 shows a C-O is
present.
➤ They are equal heights showing that
there are an equal number of carbon
environments.