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Infrared absorption spectra of 11 solid hexafluorosilicates and the Raman spectra of aqueous solutions of some of these compounds have been investigated. Two intense bands observed in the infrared regions have been assigned as p4(Fiu) of SiFe2at 485 cm-1 and p3(Fm) of SiFe2-at 740 cm-1. The three Raman bands have been assigned as yi(Atg) at 656 cm-1, v"(F2e) at 395-400 cm-1, and vi{Eg) at 465 cm-1. By comparison with other ABe molecules and ions and observed combination bands, one estimates =325 cm-1.The infrared absorption spectra of 11 solid hexafluorosilicates have been examined in a continuation of studies of infrared absorption spectra of inorganic solids.

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