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What a screening constant in nmr?

April 26, 2017constant NMR screening

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What a screening constant in nmr?

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The screening constant is the quantity represented by omega. It is determined by the electron density and the spatial distribution of the electrons around a nucleus. This value differs for different protons. For example, protons (H) in a methyl group has a larger screening constant as compared with protons in a methylene group. The screening constant for an isolated hydrogen nucleus is zero.