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14 Cards in this Set

  • Front
  • Back

Four feature in proton NMR

Signal splitting


Integration


Number of signals


Chemical shift

NMR

Nuclear Magnetic Resonance

Nuclear Magnetic Resonance

involves an interaction between electromagnetic radiation (light) and the nucleus of an atom

If the total number of protons and neutrons is odd_____

the atom will have a net nuclear spin

Most useful nuclei for nuclear magnetic resonance

Those whose spin number is 1/2


Isotopes with no spin

12C and 16O

The stronger the magnetic field_____

the greater the energy gap (directly prop.)

The energy emitted is recorded as____

FID

FID

Free Induction Decay

The more ______ a nucleus is with electron density, the smaller the a,b, energy gap

shielded

Chemical shifts are usually measured along the bottom of a ______ scale in units of _____ with respect to the signal of a standard

delta, parts per million (ppm)

Formula for chemical shifts

Chemical shift = observed shift from TMS/operating frequency of the instrument in HZ

Protons on sp2 hybridized carbons

deshielded (downfield

Protons of sp hybridized

shielded (upfield)