CHM138H1 Chapter all: Nuclear Magnetic Resonance Spectroscopy
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CHM136H1 Full Course Notes
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Its function is based on the interaction of magnetic field and the nuclei of the atoms. Nmr is used for the determination of the chemical structure of organic molecules. Nuclei with odd number of protons and/or neutrons (eg: 1h, 13c, 15n, 19f) can be investigated because they possess a property called nuclear spin. Magnetic moment: a spinning proton generates it. It is similar to the magnetic field of a magnetic bar. There is an energy gap ( e) between the two spin states and if enough energy is absorbed the nucleus in spin state can flip to state nuclear magnetic resonance. Radio frequency radiation (rtf): the frequency of the radiation when strong magnetic field is needed for the magnetic resonance. Diamagnetism: due to the magnetic field, the electron density around the nucleus alters and creates an induced magnetic field. Two magnetic fields have effect on the protons: the stronger external and the weaker induced.
