NMR
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Why are inert samples with no H1 atoms used
As they have no H atoms they will give no peaks in the H NMR spectrum
When do you use CCl4 and CDCl3
CCl4 is a non-polar compound that is a good solvent for non-polar organic molecules. CDCl3 is a polar covalent molecule that is a good solvent for polar organic molecules.
Why is TMS used
A small amount of TMS (tetramethylsilane) is added to the sample to calibrate the spectrum. *it only gives one signal *its signal is away from all the other H signals *gives strong signal so only a small amount needed *it is non-toxic *it is inert *it has a low boiling point and so can be removed from sample easily
Keep this is mind
The δ depends on what other atoms/groups are near the H – more electronegative groups gives a greater shift
What is the number of peaks propotional to
The number of environemnts
Relative peak height
Higher it is more hydrogens/ carbons
What is a splitting pattern
Number of hydrogens on adjacent carbon + 1
Fact about N-H and O-H
Dont show splittign always singlet