The most important instrumental technique used by organic chemists to determine the structure of...
6
• The most important instrumental technique used by organic chemists to determine the structure of organic compounds. • NMR spectroscopy helps to identify functional groups, and the C-H framework of an organic compound. • The technique is based on the spinning nuclei of atoms behaving as if they were tiny magnets. These nuclei include: 1 H, 13 C, 15 N, 19 F, 31 P. Chapter 9. Nuclear Magnetic Resonance (NMR) Spectroscopy
The most important instrumental technique used by organic chemists to determine the structure of organic compounds. NMR spectroscopy helps to identify
The most important instrumental technique used by organic
chemists to determine the structure of organic compounds. NMR
spectroscopy helps to identify functional groups, and the C-H
framework of an organic compound. The technique is based on the
spinning nuclei of atoms behaving as if they were tiny magnets.
These nuclei include: 1 H, 13 C, 15 N, 19 F, 31 P. Chapter 9.
Nuclear Magnetic Resonance (NMR) Spectroscopy
Slide 3
Nuclear Magnetic Resonance (NMR) In the absence of an external
magnetic field the N-S poles of hydrogen nuclei are randomly
oriented.
Slide 4
Nuclear Magnetic Resonance (NMR) In the presence of a very
strong magnetic field, the hydrogen nuclei may align themselves
with or opposite to the external field, at different energy levels.
EnergyEnergy
Slide 5
Nuclear Magnetic Resonance (NMR) EnergyEnergy If the sample is
irradiated with electromagnetic energy (radio frequency energy),
the nuclei absorb energy, the poles flip, and the energy of the
nuclei are at the same level.
Slide 6
Nuclear Magnetic Resonance (NMR) EnergyEnergy When the excited
nuclei relax, the absorbed energy is released and measured, giving
a signal on the NMR spectrum.
Slide 7
BSU 400 MHz NMR Spectrometer Modern high field NMR
spectrometers have superconducting magnets. BSU 400MHz NMR obtained
with a $350,000 from the NSF. 1 MHz = 106 Hz (measure of frequency
of EMR) AM radio ~ 1 MHz FM radio ~ 100 MHz
