3.6 - Organic Analysis
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How do you represent the time of flight ionisation equations?
M(g) + e- -> M+• + 2e- M+• = molecular ion or radical cation
Where does fragmentation occur to give a major peak?
At an acyl group RCO
How do you draw write a fragmentation equation using CH3COCH3?
[CH3COCH3]+• -> CH3CO (+ on the C) + CH3 (• on the C) The + and the • could also be on opposite molecules but the + on the acyl is more stable
What is the base peak?
RCO (+ on the C) The most common Most stable Easiest to form Always has 100% relative abundance
What should you watch out for with mass spectrometry graphs?
Chlorine and Bromine have 2 isotopes that appear Cl35 and Cl37 1:3 ratio Br79 and Br81 1:1 ratio So there will be more peaks two units apart (There are different combos of the isotopes)
What is the full scale in infrared spectroscopy?
4000 - 400
What is the difference in peaks of O-H alcohol and O-H acid?
O-H alcohol = perfect isolated curve O-H acid = merges in to the spikes of C-H bonds therefore very wide
What does the C≡N peak look like?
Tiny range so looks like a needle
How should you approach matching Infrared spectroscopy graphs to compounds?
Label the main identifying features of the graph, such as functional groups