CHEM 341 Lecture Notes - Nuclear Magnetic Resonance, Allyl Group, Electronegativity

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30 Mar 2014
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Nmr provides information on individual atoms and their environments in a molecule: connectivity. Two forms of nmr are very useful for organic chemists: 1h nmr and 13c nmr. These isotopes have allowed spin states of + and (or multiples thereof). Three types of information provided in nmr spectra: (chemical shift), integration (how many h"s), splitting (neighbors) 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 states. Applying the exact amount of energy to that nucleus is called inducing the nucleus into resonance . Every nucleus responds differently due to its unique environment.