Wikipedia
Pentafluorothiophenol
Pentafluorothiophenol is an organosulfur compound with the formula CFSH. It is a colorless volatile liquid. The compound is prepared by the reaction of sodium hydrosulfide and hexafluorobenzene. With a pK of 2.68, it is one of the most acidic thiols. Its conjugate base has been used as a ligand in coordination chemistry