Magnetically equivalent: Difference between revisions
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imported>Sekhar Talluri (describe difference between chemical and magnetic equivalence.) |
imported>Sekhar Talluri m (add subpages tag) |
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If a set of nuclei exist in identical environments, they are expected to have the same chemical shift. Such nuclei are called chemically equivalent. | If a set of nuclei exist in identical environments, they are expected to have the same chemical shift. Such nuclei are called chemically equivalent. | ||
If in addition, each member of the set has exactly same interaction (J-coupling) to every other magnetically active nucleus in the molecule, then the nuclei are also magnetically equivalent. | If in addition, each member of the set has exactly same interaction (J-coupling) to every other magnetically active nucleus in the molecule, then the nuclei are also magnetically equivalent. | ||
A set of nuclei that are magnetically equivalent will also be chemically equivalent, however, chemical equivalence does not guarantee magnetic equivalence. | A set of nuclei that are magnetically equivalent will also be chemically equivalent, however, chemical equivalence does not guarantee magnetic equivalence. | ||
e.g. all protons in benzene are magnetically equivalent. | e.g. all protons in benzene are magnetically equivalent. | ||
Revision as of 08:14, 8 October 2008
If a set of nuclei exist in identical environments, they are expected to have the same chemical shift. Such nuclei are called chemically equivalent. If in addition, each member of the set has exactly same interaction (J-coupling) to every other magnetically active nucleus in the molecule, then the nuclei are also magnetically equivalent. A set of nuclei that are magnetically equivalent will also be chemically equivalent, however, chemical equivalence does not guarantee magnetic equivalence. e.g. all protons in benzene are magnetically equivalent.