Naming amines

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Menu
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A gaseous sample compound is injected into the
mass spectrometer.
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It is bombarded by high energy electrons from an
electron gun.
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A molecular ion is produced. It contains an
unpaired electron so it is also a free radical.
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A molecular ion is produced. It contains an
unpaired electron so it is also a free radical.
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If a covalent bond in the molecular ion breaks,
fragmentation happens.
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Fragmentation produces an ion and a free radical.
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Only the ion is attracted to the charged plates
in the mass spectrometer and detected
subsequently.
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End of section one, return to menu by clicking
"Reset".
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This is the displayed formula of propanone,
CH3COCH3. What might happen to propanone in the
mass spectrometer?
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A molecular ion could form. This will be detected
by the mass spectrometer and produce a peak in
the mass spectrum.
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What is the mass/charge ratio, m/z, of the
molecular ion?
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What is the mass/charge ratio, m/z, of the
molecular ion?
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What is the mass/charge ratio, m/z, of the
molecular ion?
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What is the mass/charge ratio, m/z, of the
molecular ion?
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What is the mass/charge ratio, m/z, of the
molecular ion?
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The relative formula mass, Mr, is 58.
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The charge on the ion is 1, so the m/z ratio is
58158.
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The molecular ion will produce a peak in the mass
spectrum here.
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A covalent bond in the molecular ion may break
causing fragmentation.
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Fragmentation could produce the carbocation,
CH3. This will give a peak in the mass spectrum.
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The free radical, COCH3.,will not give a peak in
the mass spectrum.
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What is the mass/charge ratio, m/z, of the CH3
ion?
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What is the mass/charge ratio, m/z, of the CH3
ion?
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What is the mass/charge ratio, m/z, of the CH3
ion?
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The relative formula mass, Mr, is 15.
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The charge on the ion is 1, so the m/z ratio is
15115.
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The CH3 ion will produce a peak in the mass
spectrum here.
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Fragmentation could also produce a methyl
radical, CH3. This will not give a peak in the
mass spectrum.
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Fragmentation could also produce a methyl
radical, CH3. This will not give a peak in the
mass spectrum.
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The COCH3 ion will give a peak in the mass
spectrum.
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What is the mass/charge ratio, m/z, of the COCH3
ion?
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What is the mass/charge ratio, m/z, of the COCH3
ion?
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What is the mass/charge ratio, m/z, of the COCH3
ion?
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What is the mass/charge ratio, m/z, of the COCH3
ion?
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What is the mass/charge ratio, m/z, of the COCH3
ion?
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The relative formula mass, Mr, is 43.
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The charge on the ion is 1, so the m/z ratio is
43143.
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The COCH3 ion is the most stable fragment and
forms the base peak.
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These are the major peaks in the mass spectrum of
propanone. There will be others from further
fragmentation.
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End of section two, return to menu by clicking
"Reset".
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This table summarises some common fragments lost
because of fragmentation or seen in mass spectra.
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End of section three, return to menu by clicking
"Reset".