Abstract

The reaction of sulphur tetrafluoride with chlorine monofluoride, at ambient temperature and in the presence of caesium fluoride, to give sulphur chloride pentafluoride, has been shown to be a true surface reaction from experiments involving [ 36Cl] chlorine monofluoride and [ 35S] sulphur tetrafluoride. Retention of chlorine monofluoride by caesium fluoride is significant and results in the compound behaving as a catalyst poison, but retention of sulphur tetrafluoride is less marked. Chlorine monofluoride and sulphur tetrafluoride are both adsorbed by thallium(I) fluoride but the compound does not behave as a catalyst. The different behaviour is ascribed to differences in the bonding between sulphur tetrafluoride and the metal fluoride surface.

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