Organic Spectroscopy Lecture 5 Notes

Organic Spectroscopy Lecture 5 Notes - Multiple Pulse NMR...

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©2013 Gregory R. Cook, NDSU Multiple Pulse NMR Chem 744 Spring 2011 Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 2 Pulse Sequence 1 H Preparation Z X Y Z X Y Z X Y 90° R f pulse in X direction time Z X Y excess spin in Z direction M tipped into XY plane Precession with relaxation generates FID Equilibrium 90° detection FT frequency Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 3 Pulse Sequence 1 H Preparation Z X Y Z X Y Z X Y 90° R f pulse in -X direction time Z X Y excess spin in Z direction M tipped into XY plane Precession with relaxation generates FID Equilibrium 90° detection FT frequency negative peak Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 4 Linking Pulses Together Modern FT NMR instruments allow for many different ways to manipulate the magnetization to achieve different effects. Multiple pulse NMR can add not only additional magnetization pulses, but time for the magnetization to evolve between pulses and time for magnetizations to mix. preparation evolution t 1 mixing τ detection t 2 Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 5 Varian s2pul standard sequence Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 6 Inversion-Recovery Experiment (180) x -t 1 -(90) x - acquire Z X Y Z X Y M Z > 0 negative peak 180° M Z < 0 90° Z X Y acquire FT t 1 Z X Y M Z = 0 null peak 90° Z X Y acquire FT t 1 Z X Y M Z = 0 positive peak 90° Z X Y acquire FT 90° 180° t 1 evolution Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 7 Inversion-Recovery Experiment Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 8 Inversion-Recovery Experiment Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 9 13 C NMR pulse sequences Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU 10 13 C NMR pulse sequences Thursday, January 17, 13
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©2013 Gregory R. Cook, NDSU
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Organic Spectroscopy Lecture 5 Notes - Multiple Pulse NMR...

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