45Scandium (45Sc) is a high sensitivity nucleus but with a 100% natural abundance that yields broad lines even in symmetric environments over a wide chemical shift range. 45Sc is a spin 7/2 nucleus and is therefore quadrupolar. As a result, the signal width increases with asymmetry of the environment. 45Sc NMR is rarely used because scandium is rare and has a limited chemistry and when it is used it is to study the chemical environment of the scandium. Each type of Scandium compound has its characteristic chemical shift (fig. 2).
Fig. 1. Chemical shift ranges for scandium NMR (X = halide)
We do not have experience of 45Sc NMR in our laboratory but could provide the service if given an appropriate sample.
|Chemical shift range||350 ppm, from -100 to 250|
|Frequency ratio (Ξ)||24.291747%|
|Reference compound||0.06 M Sc(NO3)3 in D2O|
|Linewidth of reference||270 Hz|
|T1 of reference||5 × 10-3 s|
|Receptivity rel. to 1H at natural abundance||0.302|
|Receptivity rel. to 1H when enriched||0.302|
|Receptivity rel. to 13C at natural abundance||1780|
|Receptivity rel. to 13C when enriched||1780|
|Linewidth parameter||66 fm4|
Some of the materials mentioned here are very dangerous. Ask a qualified chemist for advice before handling them. Qualified chemists should check the relevant safety literature before handling or giving advice about unfamiliar substances. NMR solvents are toxic and most are flammable. Specifically, the toxicity of scandium salts are of unknown on account of their scandium under normal circumstances, however, their anions may be toxic.