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2Deuterium NMR
2Deuterium (heavy hydrogen) NMR is usually used for field frequency lock. At natural abundance it has very low sensitivity but when enriched it is of medium sensitivity. Deuterium usually yields broad signals whose line width typically varies between a few hertz and a few kilohertz. The spectrum has the same narrow chemical shift range as for 1H but its low resolution and lower sensitivity make it a poor alternative. Deuterium-deuterium couplings are about 40 times smaller that proton-proton couplings and are therefore not observed. However, in partially deuterated molecules small proton-deuterium couplings can be observed. The main use of deuterium spectra is for determining the effectiveness of chemical deuteration.
1H and 2D-NMR spectra of Amphetamine sulfate–d3 showing successful specific deuteration of the methyl图谱见附件