![]() Anyone reporting 31P chemical shifts should rationalize the data with the structure at phosphorus and avoid assignment errors, and they should be observant about any unusual effects that might be operating on the shielding phenomenon. The 31P shift is not just a physical constant like a melting point, however it is a definite statement about the bonding at phosphorus and the nature of the groups attached to this nucleus. Indeed, a great majority of the research papers now being published on phosphorus compounds include 31P NMR shift data. It is a simple matter to record a 31P NMR spectrum with modern spectrometers, and many thousands of phosphorus compounds have been characterized by their chemical shifts. The 31P isotope is 100% naturally abundant, and has a spin quantum number of 1/2. Chemists and biochemists working with these compounds are very fortunate to be dealing with a central atom that has outstanding properties for nuclear magnetic resonance spectral characterization. Furthermore, natural phosphorus compounds are well recognized to play vital roles in living systems. ![]() ![]() Organophosphorus chemistry is of increasing importance as a field that can provide new compounds with practical value in agriculture, medicine, catalysis, etc.
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