Proton NMR (also Hydrogen-1 NMR, or 1HNMR) is the application of
nuclear magnetic resonance in
NMR spectroscopy with respect to
hydrogen. Simple NMR spectra are recorded in solution, and solvent protons must not be allowed to interfere. Therefore a large range of
deuterated solvents exist especially for NMR such as deuterated
chloroform CDCl3 and deuterated
dimethyl sulfoxide (CD3)2SO. These solvents contain small quantities of undeuterated solvent which may give rise to a signal; CHCl3 is seen as a single peak at 7.27
ppm. Water may be present as a contaminant, this gives a broad peak whose chemical shift varies greatly with solvent; it occurs around 1.6 ppm in CDCl3. Spectra are usually recorded against
tetramethyl silane as the internal standard, set as zero.
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