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Enhancing NMR Spectra with Powerful Magnetic Fields and Decoupling Techniques

Explore the impact of strong magnetic fields, shift reagents, and relaxation reagents on NMR spectra. Learn about spin decoupling, selective irradiation, and broad-band decoupling for accurate analysis of coupled nuclei. Enhance your understanding of spin-lattice and spin-spin relaxation processes to optimize NMR results.

marjoriecollins
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Enhancing NMR Spectra with Powerful Magnetic Fields and Decoupling Techniques

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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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