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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) |