X-ray photoelectron spectroscopic study of sulphonamides: Charge distribution and tautomerism

Abstract

The X-ray photoelectron spectra of several sulphonamides, N-substituted sulphonamides, and their alkali salts were registered in the solid state. When comparing the salts with the corresponding acids, shifts of the N1s, S2p, and O1s core binding energies were observed which were discussed in terms of the charge distribution in the anion. In the case of N-hydroxybenzenesulphonamide (III) these shifts can also serve to confirm the tautomeric structure of the anion (B) as it has been inferred from other physical methods.