NMR/Carbon 13 Flashcards
What solvent is used in NMR?
No hydrogen solvent - eg CDCl3
Why is D used in the solvent instead of H?
It is an isotope of hydrogen that has an even mass number so it doesn’t give a peak.
What makes a reference peak in NMR?
TMS
Why does TMS make a reference peak?
It has 12 equivalent H’s so the H’s appear around 0 away from the other protons on the scale
What does the number of peaks in NMR show?
The number of non-equivalent proton environments
What does the simplest ratio / integration in NMR show?
Number of protons in that environment
What does the chemical shift (ppm) in NMR show?
Type of proton environment
What rule is associated with splitting in NMR?
n + 1 rule
n = number of non equivalent protons on adjacent carbon(s)
What does a singlet splitting pattern show in NMR?
There are no non-equivalent protons on adjacent carbon(s)
What does a doublet splitting pattern show in NMR?
There is 1 non-equivalent protons on adjacent carbon(s)
What does a triplet splitting pattern show in NMR?
There are 2 non-equivalent protons on adjacent carbon(s)
What does a quartet splitting pattern show in NMR?
There are 3 non-equivalent protons on adjacent carbon(s)
How do you remove OH/NH?
Heavy water (D2O)
What does the number of peaks tell us in carbon 13?
The number of non-equivalent carbon environments
What does the chemical shift tell us in carbon 13?
Type of carbon environment
