The Raman spectra of PCl5, SbCl5, NbCl5, TaCl5, MoCl5, NbBr5, and TaBr5 in the gas phase have been recorded. In all cases the data is consistent with the presence of five-co-ordinate trigonal bipyramidal species. The Raman spectra of gaseous PCl5, SbCl5, and MoCl5, show intersting temperature-dependent effects.