Characterization
Volatile thiols are easily and almost unerringly detected by their distinctive odor. S-specific analyzers for gas chromatographs are useful. Spectroscopic indicators are the D2O-exchangeable SH signal in the 1H NMR spectrum (33S is NMR active but signals for divalent sulfur are very broad and of little utility). The νSH band appears near 2400 cm−1 in the IR spectrum. In a colorimetric test, thiols react with nitroprusside.
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