Tetrakis pentafluorosulfanyl hydrazine, SF5 2NN SF

The preparation of (SFglaNNCSFglg (a white solid m.p., 44.5-46°C) is claimed from the UV photolysis of SFgNCl2 and SFgCl (228). However, it was later demonstrated that the white solid is (SFglaN (225). 

When NSF3 is fluorinated at low temperature with elemental fluorine, AT-(pentafluorosulfanyl)iminosulfur tetrafluoride is formed in -50% yield (229). 

The NSF4 group in SF5NSF4 functions both as a fluoride ion donor and as a fluoride ion acceptor, e.g.. 

Bis(pentafluorosulfanyl)amine is prepared in quantitative yield by the addition of hydrogen fluoride to SF5NSF4 (214). It is a colorless liquid that boils at 60.4°C, and it is stable in glass at room temperature. At elevated temperatures in the presence of alkali metal fluorides, it loses HF and forms SF5NSF4. It is a weak acid, which with large cations forms stable salts such as Ph4P N(SF5)2 (229). 

AT-fluoro- and AT-chlorobis(pentafluorosulfanyl)amines are obtained in 91 and 87% yields from the corresponding cesium salt (214). 

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