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Improving NMR-spectra

Improving NMR-spectra. More powerful magnetic field Shift reagents Relaxation reagents Spin dekobling. Spin decoupling. Summary spin decoupling. Selective 1 H irradiation: Decoupling of all nuclei whic are coupled to the irradiated nuclei. Selective 1 H irradiation:

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Improving NMR-spectra

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  1. Improving NMR-spectra • More powerful magnetic field • Shift reagents • Relaxation reagents • Spin dekobling

  2. Spin decoupling

  3. Summary spin decoupling Selective 1H irradiation: Decoupling of all nuclei whic are coupled to the irradiated nuclei. Selective 1H irradiation: Decoupling of only the one C bonded to the H. Broad band decoupling: All H’s irradiated and every non- equivalent C will give one line. Powerful irradiation of all H’s: Keeps the coupling information, multiplets with small constants.

  4. The effect of higher magnetic field

  5. Shifts reagents

  6. Effect of relaxation reagents

  7. Two types of relaxation Z-direction: τ1 Spin-lattice relaxation xy-plane: τ2 Spin-spin relaxation

  8. Spin-latticerelaxation, T1

  9. Spin-spinrelaxation, T2

  10. Τ1 is inverse proportional to # og H’s

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