Molecular vibrational spectra of potassium peroxymonosulfate, KHSO5 and KHSO5 · H2O, and of the aqueous peroxymonosulfate ion

Both i.r. and Raman spectra of solid anhydrous KHSO5 and KHSO5 · H2O were measured, along with the Raman spectrum of the peroxymonosulfate ion, HSO−5, in aqueous solution. A normal coordinate analysis of the ion was carried out, and the fundamental frequencies and force constants are compared with those of the isoelectronic fluoroxysulfate ion, SO4F−.