CHEMICAL-SHIFT REFERENCES FOR SE-77 NMR-SPECTROSCOPY - SELENOUS ACID

The temperature and concentration dependences of the chemical shift of aqueous selenous acid were studied in order to establish a precise re lationship between the shift of this convenient reference and that of dimethyl selenide. The chemical shift of saturated H2SeO3 in H2O on th e Me2Se shift scale at 20-degrees-C is 1300.0 ppm and its temperature coefficient is 0.094 ppm K-1. The relationships to the chemical shifts of Me2Se in CDCl3 and SeO2 in D2O are also discussed. The results per mit the correlation of Se-77 NMR shifts from several sources.