Summary of the sections "chemical shift" and
- If protons have similar chemical environments, then
typically their NMR signals also have similar chemical shifts. It is
therefore possible to assign certain characteristic chemical shift
ranges to the protons of the various functional groups in organic
compounds. (A table with the most common groups can be found here).
- The chemical shift can be expressed
On the page that covers this topic
we also listed the t
scale for sake of completeness. However, today it is of little else but
- as the frequency difference Dn between the signal of a
standard (usually tetramethylsilane - TMS) and the respective signal of
- as a frequency independent value on the d-scale according to the
is the base frequency of the sepectrometer used.
- The intensity of a signal is determined as the area
under the curve of an NMR spectrum (Done usually automatically, using a
cumulative integral across the full spectral width) (see page 53).
- The intensity of a signal is proportional to the
number of equivalent protons that give rise to it. Therefore the ratio
between the intensities of a set of signals is roughly equal to the
number of equivalent protons that contribute to each of the signals. (see page 53).
Alright, time for a break - you deserve it!
As soon as you have fully recovered, you might want to continue on page 72!