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 = η5-C5H5; M = Mn, Re); CpMn(CO)2(CS); [CpFe(CO)2]2; [CpMo(CO)3]2; BzCr(CO)3 (Bz = η6-C6H6); BzCr(CO)2(CS); M2(CO)10 (M = Mn, Re); and Fe2(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.