Mass Spec Flashcards
What does the molecular (2nd but furthest right) peak tell you?
The mr of the compound
When a molecular ion is broken up into fragments what shows up on the mass spec, ions or free radicals?
Ions
To work out the structure of a molecule what two steps must you take?
1) identify fragments
2) piece them together
More stable ions give…..peaks
Higher
Carbocations and acylium ions are
Very stable
Tertiary carbocations are more stable and give higher peaks than primary or secondary carbocations because…
They have three alkyl groups pushing the electron density towards the C+ stabilising the ion
To work out the number of carbons in the compound you do…
Height of m+1 peak divided by height of m peak x 100
If the ratio of m:m+2 is 3:1 than what is present
Chlorine
If the ratio of m:m+2 is 1:1 than what is present?
Bromine
