TRANSPARENT NMR SHIFT REAGENTS

摘要

Rare earth metal chelates of beta -diketones that are deuterated or deuterated plus halogenated and contain no more than 5 hydrogen atoms in the diketone moiety are described. The novel chelates are useful NMR shift reagents particularly because they not only solubilize the rare earth metal but additionally the beta -diketone ligand is substantially to completely transparent to proton NMR analysis. The chelates are prepared by reacting the rare earth metal nitrate with the beta -diketones by conventional methods.