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Phosphorus-31 NMR : ウィキペディア英語版 | Phosphorus-31 nuclear magnetic resonance Phosphorus-31 NMR spectroscopy (NMR stands for nuclear magnetic resonance) is an analytical technique. Solution 31P-NMR is one of the more routine NMR techniques because 31P has an isotopic abundance of 100% and a relatively high magnetogyric ratio. The 31P nucleus also has a spin of ½, making spectra relatively easy to interpret. Phosphorus is commonly found in organic compounds and coordination complexes (as phosphines), making it useful to measure 31P NMR spectra routinely. ==Operational aspects== With a magnetogyric ratio 40.5% of that for 1H, 31P NMR signals are observed near 202 MHz on an 11.7 Tesla magnet (used for 500 MHz 1H NMR measuements). Chemical shifts are referenced to 85% phosphoric acid, which is assigned the chemical shift of 0, with positive shifts to low field/high frequency.〔 Due to the inconsistent nuclear Overhauser effect, integrations are not useful. Most often, spectra are recorded with protons decoupled.
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