3AL+Lecture+9 - Spin-Spin Splitting (J Coupling) Coupling...

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Spin-Spin Splitting ( J Coupling) Coupling of spins provides connectivity information about neighboring nuclei
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1 H NMR Spectrum of 1,1,2-trichloroethane H A H B Observed! Predicted
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J Coupling Local magnetic felds oF nuclei are in±uenced by the local magnetic felds oF neighboring, nonequivalent nuclei Review: When spin ½ nuclei are placed in an external magnetic feld, they align into two spin states, alpha and beta. The alpha spin state is aligned with the feld and any inFuence exerted by such nuclei will be opposite ±rom those in the beta state whose feld is aligned against the external feld.
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H A ’s Infuence on H B where H B would be with no J coupling resonance due to H A Ћ 's infuence on both H B 's resonance due to H A Ќ 's infuence on both H B 's J AB = 6.0 Hz a doublet (d) Ў 3.9 (d, 2H, J AB = 6.0 Hz)
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H B ’s Infuence on H A where H A would be with no J coupling resonance due to H B Ћ 's infuence on H A resonance due to H B Ќ 's infuence on H A a triplet (t) Ў 5.8 (t, 1H, J BA = 6.0 Hz) BA = 6.0 Hz BA = 6.0 Hz J AB = J BA !
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3AL+Lecture+9 - Spin-Spin Splitting (J Coupling) Coupling...

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