Vibrational Spectra of IF7 and ReF7

Abstract

Raman spectra of IF₇ and ReF₇ have been observed for the first time in the vapor state. Infrared spectra of the vapors have also been re‐examined. Earlier difficulties regarding possible coincidences in the IF₇ spectra have been removed. The data suggest that both molecules belong to symmetry group $D_{\text{5h}}$ , although there are some significant as yet unexplained differences between them.