Metal surface interaction with Pi-acceptor molecules: PF3 adsorption


In a continuing effort to characterize the chemical properties of metal surfaces, infrared spectra of PF3 adsorbed on vanadium, iron, nickel, palladium, copper and aluminum evaporated into an oil matrix have been obtained. The spectra indicate adsorption without dissociation to give structures similar to PF3 coordination complexes with symmetric and asymmetric P-F stretching frequencies in the 800 cm-1 region and a P-F bending frequency in the 500 cm-1 region. As in the homogeneous complexes CO and PF3 can replace each other although on the surface CO is more tightly bound than PF3. The molecular orbital view of σ donation and π back bonding which has been successful with chemisorbed CO is shown to be useful also in understanding strengths of PF3 adsorption on different metals and shifts in infrared frequencies from metal to metal, with changing surface coverage and as PF3 is replaced by CO. © 1974.

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Journal of Colloid And Interface Science