Search for a Jahn-Teller Effect in IrF6

Abstract

An investigation of the vibrational spectra of IrF₆ has failed to reveal the anomalies found for OsF₆ that were attributed to a Jahn‐Teller coupling. This is taken to indicate that the Γ₈ ground electronic state of IrF₆ has a strong spin character. For the vapor in the NaCl range the observed absorption frequencies (cm^—1) and their assignments were: 720 (σ₃), 852 (σ₂+σ₆), 921 (σ₂+σ₄), 979 (σ₁+σ₄), 1364 (σ₂+σ₃), and 1425 (σ₁+σ₃). A Raman shift of 651 cm^—1 ascribed to σ₂ was obtained for a solution of IrF₆ in n‐C₇F₁₆.