Raman Spectrum of Antimony Pentafluoride in the Gaseous Phase as a Function of Temperature. Evidence for a Trigonal Bipyramidal Shape for the Monomeric Species

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Abstract
The gas phase Raman spectrum of antimony pentafluoride as a function of temperature shows clearly the dissociation of a polymeric species. The infrared spectrum of the gas (under conditions where the Raman spectrum shows no evidence for the presence of monomer) is closely similar to that of the liquid. This spectrum is also similar to that found in previous matrix isolation studies when monomer was thought to be present. It is likely that the earlier assignment of a C4v shape to monomeric antimony pentafluoride is erroneous.

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