Action of acids on TTFs affords cation radicals or/and protonated species,
depending on conditions and substituents. The reaction of TTF derivatives w
ith acids has been monitored using W-Vis and nmr spectroscopy. Stoichiometr
ic cation-radical salts have been synthesized by preparative oxidation of T
TFs using phenyliodoso diacetate and an acid for comparison. A general sche
me for the interaction of TTFs with acids is suggested.