Chap 13 Nuclear Magnetic Resonance
NMR provides information on individual atoms and their environments in a molecule:
Two forms of NMR are very useful for organic chemists: H NMR and C NMR. Why?
All organic molecules have H’s and C’s
These isotopes have allowed spin states of + ½ and – ½ (or multiples thereof).
Three types of information provided in NMR spectra: δ (chemical shift), integration (how
many H’s), splitting (neighbors)
NMR – Background
Spinning charged particles create a magnetic field
At rest, nuclei have magnetic fields in all directions
In a magnetic field, nuclei line up with the field or against it.
It takes more energy to line up against it, making a slight gap in energy between them.
When energy is applied, nuclei can flip spin states from against field to with field.
Amount of energy applied matches the gap between the two st