Complete vibrational spectra and assignments are reported for the following species: PCl5, PCl6–, AsCl4+, AsCl6– SbCl5, SbCl6–, and GeCl62–. Partial data are reported for the species GeCl5–, SnCl5–, and SnCl62–. It is suggested that the compound AsCl5,SbCl5 is correctly formulated as AsCl4+SbCl6– while the related compound PCl5,AsCl5(although not obtained pure) is probably the salt PCl4+AsCl6–. Calculated and observed data are compared for all the MCl5 species mentioned above.