Topic 7 Modern Analytical Techniques 1
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IR spectroscopy
The frequency of IR absorbed by a covalent bond depends on • The atoms either side of the bond • The position of the bond in the molecule (O-H in the alcohol or carboxylic acid). Watch out for broad and sharp peaks
What is mass spectroscopy used for?
It is used to find the MR of the compound
What is M/Z?
M/Z is just the mass of a fragment divided by charge. As most have just a +1 charge, so it is just the same as the fragment mass.
What do the peaks show?
Peaks shows fragments of the original molecule. The last peak is the M+1 peak or the molecular ion peak. This is the same as the MR of the molecule. It isn’t fragmented or broken up
What is fragmentation?
This is when molecules break up when they are bombarded with high-energy electrons