Operational Aspects
With a magnetogyric ratio 42.5% of that for 1H, 31P NMR signals are observed near 202 MHz on a 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.
Read more about this topic: Phosphorus-31 NMR Spectroscopy
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