NMR presentationOpt

NMR presentationOpt - Nuclear Magnetic Resonance (NMR)...

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Nuclear Magnetic Resonance (NMR) Aims : • To understand the details of how NMR works. • To interpret some simple NMR spectra. Magnetic Nuclear Resonanc e In the Nucleus Involves Magnets In the Nucleus 100’s of free ppt’s from www.pptpoint.com library
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But hydrogen isn’t magnetic? In fact, the nucleus of a hydrogen atom has a very weak magnetic spin , it behaves like a weak compass needle. If a molecule containing hydrogen is placed in a strong magnetic field, the magnetic hydrogen nucleus can line up with the field or line up against it! N S S N N S N S Which is the high energy orientation? Nucleus spin aligned with the field – Low energy! Nucleus spin aligned against the field – High energy!
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S N S Add Energy N S S N Aligned = Low Energy Excited state = High energy N S S N Energy Released Back to low energy ground state When the spin falls back into line with the magnetic field it releases energy. We detect this energy and it provides information on: The environment of the hydrogen in the molecule
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NMR presentationOpt - Nuclear Magnetic Resonance (NMR)...

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