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13C NMR
3.3.15 Nuclear magnetic resonance spectroscopy (A-level only)
Appreciation that scientists have developed a range of analytical techniques which together enable the structures of new compounds to be confirmed.
Nuclear magnetic resonance (NMR) gives information about the position of 13C or 1 H atoms in a molecule.
13C NMR gives simpler spectra than 1 H NMR.
The use of the δ scale for recording chemical shift. Chemical shift depends on the molecular environment.
The use of tetramethylsilane (TMS) as a standard.
Students should be able to:
• explain why TMS is a suitable substance to use as a standard
• use 1 H NMR and 13C NMR spectra and chemical shift data from the Chemistry Data Booklet to suggest possible structures or part structures for molecules
1H NMR
3.3.15 Nuclear magnetic resonance spectroscopy (A-level only)
Appreciation that scientists have developed a range of analytical techniques which together enable the structures of new compounds to be confirmed.
Nuclear magnetic resonance (NMR) gives information about the position of 13C or 1 H atoms in a molecule.
13C NMR gives simpler spectra than 1 H NMR.
The use of the δ scale for recording chemical shift. Chemical shift depends on the molecular environment.
Integrated spectra indicate the relative numbers of 1 H atoms in different environments.
1 H NMR spectra are obtained using samples dissolved in deuterated solvents or CCl4 The use of tetramethylsilane (TMS) as a standard.
Students should be able to:
• explain why TMS is a suitable substance to use as a standard
• use 1 H NMR and 13C NMR spectra and chemical shift data from the Chemistry Data Booklet to suggest possible structures or part structures for molecules
• use integration data from 1 H NMR spectra to determine the relative numbers of equivalent protons in the molecule
• use the n+1 rule to deduce the spin–spin splitting patterns of adjacent, non-equivalent protons, limited to doublet, triplet and quartet formation in aliphatic compounds.
Credits: Neil Goalby