Introducing NMR
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NMR Spectroscopy
The NMR facility at Princeton University
Proton NMR produces a spectrum with a number of peaks. The number of peaks corresponds to the number of different chemical environments in which protons exist.
Proton NMR
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Carbon 13 NMR
TMS
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Looking at the protons
High resolution NMR - reveals a splitting pattern.
This is produced because protons on neighbouring carbon atoms can have an effect on the magnetic ("chemical") environment experienced by a given proton.
The effect will depend upon whether the proton is aligned or opposed.
Alignment will lead to a stronger magnetic field . Opposition will weaken the field.
The number of protons on a neighbouring carbon atom will dictate the number of combinations of aligned and opposed protons and therefore the number of sub environments number of sub peaks in the spectrum.
A couple of problems:
Use the data provided to work out what this molecule is. It contains carbon, hydrogen and oxygen only.
Carbon 13 NMR gives information about the number of and type of chemical environments in which carbon atoms can be found
Exam questions
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