Perfluorosulfonic acids
Perfluorosulfonic acids are chemical compounds of the formula CnFSO3H and thus belong to the family of perfluorinated and polyfluorinated alkyl compounds. The simplest example of a perfluorosulfonic acid is the trifluoromethanesulfonic acid. Perfluorosulfonic acids with six or more perfluorinated carbon atoms, i.e. from perfluorohexanesulfonic acid onwards, are referred to as long-chain.
Properties
Perfluorosulfonic acids are organofluoroanalogues of conventional alkanesulfonic acids, but they are several pKA units stronger. Their perfluoroalkyl chain has a highly hydrophobic character.Use
, for example, has been used in hard chromium plating.was included in Annex B of the Stockholm Convention in 2009 and subsequently in the EU POPs Regulation.
Perfluorohexanesulfonic acid including its salts and related compounds was proposed for inclusion in the Stockholm Convention.
