Phosphorus-31 nuclear magnetic resonance observes spin-one-half phosphorus-31. An system can show a two-phosphorus doublet and a one-phosphorus triplet; three inequivalent mutually coupled phosphorus sites can each give a doublet of doublets in the first-order limit.
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Phosphorus-31 nuclear magnetic resonance (31P NMR) is a type of nuclear magnetic resonance spectroscopy that studies the behavior of phosphorus nuclei in a magnetic field. This technique is particularly useful for analyzing compounds containing phosphorus, such as nucleotides, phospholipids, and various organophosphorus compounds. **Key Features of 31P NMR:** 1.