The first fluorinated cationic eight-membered chalcogen-nitrogen ring system, containing Te and Se, [F[graphic ommitted]]+[TeF5]- has been prepared by reacting Se(NSO)2 with TeF4; its molecular structure has been determined by X-ray crystallography (as a byproduct [Se2N2S]2[TeF5]2 was isolated).
A. Haas and M. Pryka, J. Chem. Soc., Chem. Commun., 1993, 993 DOI: 10.1039/C39930000993
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