Ch_322a_9.010

Ch_322a_9.010 - Spin-Spin Coupling The splittings observed...

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Spin-Spin Coupling The splittings observed in the resonances follow a pattern: A resonance due to a group of magnetically equivalent H is split into n+1 lines by n H on adjacent carbons. Equivalent H on adjacent carbons do not cause such splittings. CH 3 -C-CH 3 H I Resonance B is split into a doublet by the single H. Resonance A is split into a septet by the 6 equivalent H of the methyl groups. These splittings arise from interactions of the nuclear spins of nonequivalent H on adjacent carbons. This interaction is called spin-spin coupling .
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1 H in a magnetic field can exist in two spin states defined by the orientation of the nuclear magnetic dipole relative to the external magnetic field. B o E B o + + spin state 1 μ = + 1/2 spin state 2 = - 1/2 At a magnetic field of Bo, a transition from state 1 to 2 occurs: ! E = h " = # B o h 2 $ The transition from state 1 to state 2 occurs with absorption of a photon of rf of value ! . Nuclear Spin States
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_9.010 - Spin-Spin Coupling The splittings observed...

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