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SeBr3AsF6 and TeBr3AsF6 were prepared from the elements and an excess of bromine and arsenic pentafluoride, as well as from Se4(AsF6)2 and Te4(AsF6)2 with excess bromine. SeBr3SbF6 was prepared from Se4(SbF6)2 and bromine, and TeBr3AsF6 from tellurium tetrabromide and arsenic pentafluoride. Br3AsF6 was found to oxidize arsenic trifluoride and sulphur dioxide to arsenic pentafluoride and SO2BrF respectively. Reaction pathways to the tribromochalcogen cations are discussed. Raman spectra of the tribromochalcogen salts were obtained. Assignments were confirmed, and force constants derived from normal coordinate analyses and compared with those derived for SBr3+, PBr3, AsBr3, and SbBr3.

stereochemical rigidity of CF3SF3 at ambient temperature.The fact that Jf sc is slightly larger than /FaSc may be a reflection of the fact that the equatorial plane of a trigonal bipyramid features more sulfur 3s character than the axes.The differences in the axial and equatorial F-S-C couplings may be useful for the stereochemical assay of fluorosulfuranes.Acknowledgment. The authors are grateful to the Office of Naval Research (Contract N00014-76-C0577, Task No. NR 053-612) for financial support. Gratitude is also expressed to the Jet Propulsion Laboratory, Pasadena, Calif., for the loan of the Varían A 56/60 NMR spectrometer.

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