Synthesis, chemical properties, and U.V. spectra of thio-thionyl fluoride and difluorodisulphane

Abstract

The preparation of difluorodisulphane, FSSF, by the silver fluoride/sulphur reaction is described. Difluorodisulphane is unstable at room temperature and rearranges spontaneously into thio-thionyl fluoride, SSF₂. The largest observed first-order half-life time of FSSP gas was 4.7 hr at 21.8 ± 0.3°. The decomposition of FSSF is catalysed by hydrogen fluoride and boron trifluoride. Chemical reactions of the isomers with AgF₂, Cl₂, BCl₃, S₂Cl₂, acetone, benzoic acid, Pyrex, and quartz were studied. The absorption spectra of gaseous FSSF and SSF₂ were recorded in the range of 10000 to 53000 cm^-1. Medium to high intensity continua were noted with maxima for FSSF at 50200±250 and 41400±250 cm^-1 and for SSF₂ at 53000±500, 41400±250, and 33800±400 cm^-1.