Transcription of Chapter 13: NMR Spectroscopy
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Chapter 13: NMR Spectroscopy
Chapter 13: Chapter 13: NMR SpectroscopyNMR SpectroscopyNMR SpectroscopyNMR Spectroscopy39 NMR SpectroscopyNMR Spectroscopy By far the most important and useful technique to identify organic molecules. Often the only technique necessary. NMR spectrum can be recorded for many NMR spectrum can be recorded for many different nuclei (they need to have magnetic properties) such as: 1H, 3H, 13C, 15N, 19F, 31P We will focus only on proton (1H) nmr here40 Nuclear SpinNuclear Spin A nucleus with an odd atomic number or an odd mass number has a nuclear spin. The spinning charged nucleus generates a magnetic An external magnetic field (B0) applies a force to a small bar magnet, twisting the bar magnet to align it with the external field.
horizontal axis of the spectrum (the δ ... that is close to a whole number. 65 1)Ratios are: 0.5 : 1.0 : 1.5 : 3.0 2)Since it is not possible to have 0.5 proton, multiply by 2 ... When two different protons are coupled, the coupling constant for H a will be the same as that found for H b.
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