The new con~pounds M(SC6F5), where M = Cs, TI, Cu, Au, and Ph3Pb; M(SC6F5),, where M = Pb, Cd, Hg, Ni, and Pt; M(SC6F&, where M = As or Bi; and Sn(SC6F5),, have been prepared from pentafluorothiophenol and metal ions in aqueous solution. Zn(SC6F,)2 has been prepared from zinc oxide and pentafluorothiophenol in methanol. The co~npounds have been characterized, and their infrared spectra and 'H and 19F nuclear magnetic resonance spectra examined.Some of the reducing properties of pentafluorothiophenol and its polymerization have been studied.Canadian Journal of Chernislry, 46, 2699Chernislry, 46, (1968 The reactions, if any, of an aqueous suspension of pentafluorothiophenol with various metal ions can be divided into three categories, (1) formation of pentafluoro-phenylthio metal derivatives, (2) reduction forming bis(pentafluor0-phenyl) disulfide, and (3) polymerization forming perfluoropoly(pheny1ene sulfide); one specific reaction or a combination may be observed with a particular metal ion. This paper describes the reactions of pentafluorothiophenol with aqueous solutions containing the ions, or compounds, Cs', Pb2+,