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Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)

O 58.59: Poster

Wednesday, March 28, 2012, 18:15–21:45, Poster B

Ferrocene ultrathin films on NaCl(100) – a high resolution FTIR studyBirgit Vogt and •Jochen Vogt — Chemisches Institut der Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany

Ferrocene (C5H5)Fe2+(C5H5) is a prototype of an organometallic sandwich complex. The thin film properties of ferrocene are of interest in many respects, e. g. due to its potential use as a precursor for the deposition of iron or iron oxide films on surfaces [1]. We report on the preparation of ultrathin films of ferrocene on the NaCl(100) surface below 30 K and ultrahigh vacuum conditions. The films were characterized using polarization fourier transform infrared spectroscopy (PIRS). Upon cooling the films from 180 K to 25 K, pronounced reversible frequency shifts and splittings of the distortion modes of the cyclopentadienyl rings are observed. The bending mode at 818 cm−1 splits into at least six narrow components between 810 and 830 cm−1 with different fractions of absorption in s- and p-polarization, respectively. These are consistent with different orientations of the associated dipole moments with respect to the substrate surface, and a high degree of film crystallinity. Coadsorption experiments with CO2 reveal that the applied method of preparation results in ferrocene films which cover 60 to 80 percent of the substrate surface.
A. B. F. Martinson et al., J. Phys. Chem. C 115 (2011), 4333

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