Bis(sulfinylamido)tellurium(IV) fluoride: a versatile synthon in tellurium–nitrogen chemistry

Halogen exchange reactions between F2Te(NSO)2 and Me3SiX provide X2Te(NSO)2 (X=Cl, Br). The brominated derivative can also be made from Te(NSO)2 and Br2 or from Te and BrNSO. Pyrolysis of F2Te(NSO)2 gives F2TeNSNS which reacts with MF5 to salt like [FTeNSNS]+[MF6]− (M=As, Sb). Halogenation of F2Te(NSO)2 with Cl2 or Br2, ratio 2:1, provides X2Te(NSN)2TeX2. The corresponding F2Te(NSN)2TeF2 is made by decomposition of F2Te(NSO)2 dissolved in THF at room temperature during 10 days. It can be transferred by Cl2, Br2 or Me3SiX, respectively to X2Te(NSN)2TeX2 (X=Cl, Br). When F2Te(NSO)2 is reacted with X2 in an 1:1 molar ratio or with TeX4, then the bicyclus X2TeX2Te(X2)NSN (X=Cl, Br) is formed. Ionic moieties with a cage type cation 5 are obtained by treating F2Te(NSO)2 (molar ratio 1:1) or F2Te (NSN)2TeF2 with MF5 (M=As, Sb) (molar ratio 1:2) in SO2 solution. A 1:1 mixture of F2Te(NSO)2 and MF5 reacts in CH2Cl2 giving [FTe(NSO)2]+[MF6−]. In SO2 solution, F2Te(NSO)2 reacted with AsF5, molar ratio 1:2, to [Te(NSO)2]++[AsF6−]2. Metathetical reactions between F2Te(NSO)2 and [CF3C(O)]2O or Me3Si-OC(O)CF3 as well as Me3SiOS(O2)CF3 yield the novel compounds [CF3C(O)O]2Te(NSO)2 and (CF3SO2O)2Te(NSO)2, respectively. X-ray structure for 9 is provided.