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(33S) Sulfur NMR

Use our NMR service that provides 33S NMR and many other NMR techniques.

33Sulfur (33S)is a low sensitivity nucleus with a low natural abundance that yields very broad lines over a wide chemical shift range. 33S is a spin 3/2 nucleus and is therefore quadrupolar. As a result, the signal width increases with asymmetry of the environment. Hence, inorganic sulfates and sulfites yield moderately broad signals and small organic sulfites and sulfates are observable. Only the smallest organic sulfides such as CS2 (fig. 1) yield observable signals with a high-resolution spectrometer with DMSO being just too broad (10's of kHz) to be observed. Because of its low sensitivity and broad signals, 33S NMR is little used in high resolution NMR and when it is used it is mostly for sulfates and sulfites. Each type of sulfur signal has its characteristic chemical shifts (fig. 2).

Fig. 1. 33S-NMR spectra of saturated (NH4)2SO4 in D2O and neat CS2 showing increasing linewidth with increasing environmental asymmetry

Sulfur spectra

Fig. 2. Chemical shift ranges for sulfur NMR

Chemical shifts of sulfur

Properties of 33S

(Click here for explanation)

PropertyValue
Spin3/2
Natural abundance0.760%
Chemical shift range964 ppm, from -290 to 674
Frequency ratio (Ξ)7.676000%
Reference compoundsat. (NH4)2SO4 in D2O
Linewidth of reference10 Hz
T1 of reference0.015 s
Receptivity rel. to 1H at natural abundance1.72 × 10-5
Receptivity rel. to 1H when enriched2.26 × 10-3
Receptivity rel. to 13C at natural abundance0.101
Receptivity rel. to 13C when enriched13.3
Linewidth parameter61 fm4

Safety note

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, carbon disulfide is a toxic carcinogen: wear protective gloves and work in a hood.