The Ag-109 and F-19 NMR spectra of KAgF4 dissolved in anhydrous HF are repo
rted. The Ag-109 chemical shift, +5270 ppm, is far off from that of any oth
er Ag(III) or Ag(I) species, thus reflecting the extreme chemical propertie
s of the AgF4- anion. (C) 1999 Elsevier Science S.A. All rights reserved.