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1,3-Difluoro-trisulfane-1,1-difluoride is an inorganic molecular substance consisting of sulfur in a low oxidation state with fluorine. The structural formula is SF3SSF containing a chain of three sulfur atoms. At one end there are three fluorine atoms bound, and at the other one. The formula can also be written S3F4. It has a melting point of -62°C and a boiling point of 94°C. As a gas, it is unstable and breaks up to form SSF2 and SF4.[1]

SF3SSF is produced by the condensation of sulfur difluoride and an isomer of SSF2.[2] The reaction S3F4 ⇌ SSF2 + SF2 uses 6 kJ/mol.[3]

Possible isomers of S3F4 includes FSSF2SF, which has a spontaneous fluorine migration to yield F2SSSF2 which in turn spontaneously fragments to SF2 and SSF2. Another high energy structure is a ring consisting of three SF2 units.[4]


  1. ^ Willner, Helge (July 1984). "Chalkogenfluoride in niedrigen Oxydationsstufen. IX. Darstellung und Charakterisierung von SF3SSF" [Chalcogen fluorides in lower degrees of oxidation. IX. Preparation and characterization of 1,3-difluorotrisulfane 1,1-difluoride (SF3SSF)]. Zeitschrift für anorganische und allgemeine Chemie. 514 (7): 171–178. doi:10.1002/zaac.19845140721. 
  2. ^ Berry, F. J. (1984). "Chapter 6. O, S, Se, Te". Annual Reports Section "A" (Inorganic Chemistry). 81: 145. doi:10.1039/IC9848100137. 
  3. ^ Lösking, O.; Willner, H.; Baumgärtel, H.; Jochims, H. W.; Rühl, E. (November 1985). "Chalkogenfluoride in niedrigen Oxydationsstufen. X Thermochemische Daten und Photoionisations-Massenspektren von SSF2, FSSF, SF3SF und SF3SSF". Zeitschrift für anorganische und allgemeine Chemie. 530 (11): 169–177. doi:10.1002/zaac.19855301120. 
  4. ^ Jug, Karl; Iffert, Rüdiger (April 1989). "SINDO1 study of sulphur isomers and sulphur fluorine compounds". Journal of Molecular Structure: THEOCHEM. 186: 347–359. doi:10.1016/0166-1280(89)87055-1.