AC12: NMR Spec Flashcards
What solvent is used to check if there is a H in a -OH or -NH group and how does this work
deuterium - heavy water
add D2O to sample, H in OH / NH peak disappears.
What does NMR stand for
Nuclear Magnetic Resonance
Give one use of NMR
MRI scans
What kind of nuclei does NMR work with
Those with uneven number of nucleons - proton and 13 carbon
What does the area under the peak represent for proton NMR
proportional to the number of proton atoms
What is the integration trace in NMR
A stepped line that makes it easier to measure the area under the curve
When does splitting/spin-spin coupling occur in NMR
neighbouring Hydrogen atoms (on adjacent atoms) affect the magnetic field of protons and causes their peaks to split
What is the n+1 rule in NMR
If there are n inequivalent protons on the neighbouring carbon, then the peak will split into n+1 smaller peaks
Why does the peak from O-H or N-H bonds disappear if D2O is used as a solvent
H in O-H / N-H is substituted by D