FT-IR Photoacoustic Spectra of Some Solid Organometallic Complexes of Chromium, Manganese, Rhenium, and Iron

Abstract

FT-IR photoacoustic spectra have been measured at room temperature in the near- and mid-IR range (4700–500 cm −1 ) for the solid organometallic compounds: CpM(CO) 3 (Cp = η 5 -C 5 H 5 ; M = Mn, Re); CpMn(CO) 2 (CS); [CpFe(CO) 2 ] 2 ; [CpMo(CO) 3 ] 2 ; BzCr(CO) 3 (Bz = η 6 -C 6 H 6 ); BzCr(CO) 2 (CS); M 2 (CO) 10 (M = Mn, Re); and Fe 2 (CO) 9 . Vibrational assignments have been made for the fundamentals and the binary overtone and combination regions. It is much simpler to obtain data for the 4700–3500 cm −1 near-IR region with the use of PA rather than transmission IR spectroscopy with alkali halide disks since there are no problems with scattering or internal multiple reflectance. FT-IR photoacoustic spectroscopy is a convenient, nondestructive analytical method that should prove extremely useful to organometallic chemists for the rapid identification of their compounds in the solid state.