The synthesis, characterization, X-ray crystal structure and solution ESR spectrum of the paramagnetic solid, 4,5-bis(trifluoromethyl)-1,2,3-trithiolium hexafluorarsenate: implications for the identity of ‘1,2-dithiete’ cations

Abstract

The 7π radical CF3[graphic omitted]CF3+˙1, which is the first isolated example of a R[graphic omitted]R+˙ cation, is prepared by the reaction of S8(AsF6)2, S4(AsF6)2, AsF5 and CF3CCCF3 in SO2; the X-ray crystal structure consists of planes containing both monomeric radical cations and anions, the solid exhibiting Curie–Weiss paramagnetism between 25 and 200 K (µ= 1.68 µB).