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Spectroscopy Learning Module, Part 3a

Spectroscopy Learning Module, Part 3a - NMR spectroscopy is...

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NMR spectroscopy is the most powerful tool available for organic structure determination. It is used to study a wide variety of nuclei with i b ( l ) f ½ i l di 1 H spin quantum numbers ( ) of ½, including H, 13 C, 15 N, 19 F, and 31 P. Our focus in this lab will be primarily on 1 H or Our focus in this lab will be primarily on H, or proton NMR. The spinning charged nucleus generates a f ld magnetic field. When the sample is placed in an external magnetic field the nuclei respond to that field magnetic field, the nuclei respond to that field. 1
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The magnetic fields of the spinning nuclei will align either with the external field, or against the field. A photon with the right amount of energy (radio waves) can be absorbed by the molecule and cause the spinning proton to flip to the high energy state. When the nucleus relaxes back to it’s original state back to it s original state, energy is given off, and we measure that energy as our NMR spectrum. 2
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